[Bug]: Calendar invite email rejected by SMTP server due to FROM header format #57856
Description
⚠️ This issue respects the following points: ⚠️
- This is a bug, not a question or a configuration/webserver/proxy issue.
- This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
- Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
- I agree to follow Nextcloud's Code of Conduct.
Bug description
Hello,
I've searched for days and could not find any report of the same issue, sorry if I missed something.
I'm using a Nextcloud AIO instance (up-to-date) configured to send e-mails through Protonmail's SMTP servers, using a domain I own.
Notification e-mails from the nextcloud server (files changes, notifications etc) are sent fine, as well as the TEST e-mail from the SMTP settings panel.
However, when sending calendar invites, Protonmail's SMTP server rejects the e-mail, and the following message appears in nextcloud server log :
From core :
UnexpectedResponseException
Expected response code "250" but got code "550", with message "550 5.7.26 Submission not allowed for messages in which MAIL FROM <administrateur@my.domain> does not match header From <Clement via".
From dav :
Unable to deliver message to navetatd@gmail.com
Protonmail support says that the FROM header should match the FROM address, but the FROM header generated by Nextcloud is misshaped, with "Clement via" between <> which should not be the case.
Is there really an issue with FROM header formatting ? Can I solve it through Nextcloud server configuration ?
...Am I really the first person encountering this, or did I miss something ?
My invitees are not getting any invite e-mail from the calendar for now.
I hope that bug report will help ; have a nice day
Steps to reproduce
1.Setup Protonmail to use my custom domain
2.Setup Protonmail SMTP server and credentials from Nextcloud admin panel
3.Create an event in Nextcloud's calendar, including attendees
Expected behavior
Attendees should get an invite by e-mail... yet the e-mails are not sent and an error is reported in Nextcloud log.
Nextcloud Server version
32
Operating system
Debian/Ubuntu
PHP engine version
PHP 8.3
Web server
Apache (supported)
Database engine version
PostgreSQL
Is this bug present after an update or on a fresh install?
Fresh Nextcloud Server install
Are you using the Nextcloud Server Encryption module?
Encryption is Enabled
What user-backends are you using?
- Default user-backend (database)
- LDAP/ Active Directory
- SSO - SAML
- Other
Configuration report
{
"system": {
"default_language": "fr",
"default_locale": "fr_FR",
"default_phone_region": "FR",
"one-click-instance": true,
"one-click-instance.user-limit": 100,
"memcache.local": "\\OC\\Memcache\\APCu",
"apps_paths": [
{
"path": "\/var\/www\/html\/apps",
"url": "\/apps",
"writable": false
},
{
"path": "\/var\/www\/html\/custom_apps",
"url": "\/custom_apps",
"writable": true
}
],
"check_data_directory_permissions": false,
"memcache.distributed": "\\OC\\Memcache\\Redis",
"memcache.locking": "\\OC\\Memcache\\Redis",
"redis": {
"host": "***REMOVED SENSITIVE VALUE***",
"password": "***REMOVED SENSITIVE VALUE***",
"port": 6379
},
"overwritehost": "interne.vous-ecouter-pour-lavenir.fr",
"overwriteprotocol": "https",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"localhost",
"interne.vous-ecouter-pour-lavenir.fr"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"dbtype": "pgsql",
"version": "32.0.4.1",
"overwrite.cli.url": "https:\/\/interne.vous-ecouter-pour-lavenir.fr\/",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbtableprefix": "oc_",
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"instanceid": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"updatechecker": false,
"loglevel": 2,
"log_type": "file",
"logfile": "\/var\/www\/html\/data\/nextcloud.log",
"log_rotate_size": 10485760,
"log.condition": {
"apps": [
"admin_audit"
]
},
"preview_max_x": 2048,
"preview_max_y": 2048,
"jpeg_quality": 60,
"enabledPreviewProviders": {
"1": "OC\\Preview\\Image",
"2": "OC\\Preview\\MarkDown",
"3": "OC\\Preview\\MP3",
"4": "OC\\Preview\\TXT",
"5": "OC\\Preview\\OpenDocument",
"6": "OC\\Preview\\Movie",
"7": "OC\\Preview\\Krita"
},
"enable_previews": true,
"upgrade.disable-web": true,
"mail_smtpmode": "smtp",
"mail_smtpdebug": true,
"trashbin_retention_obligation": "auto, 30",
"versions_retention_obligation": "auto, 30",
"activity_expire_days": 30,
"simpleSignUpLink.shown": false,
"share_folder": "\/Shared",
"one-click-instance.link": "https:\/\/nextcloud.com\/all-in-one\/",
"upgrade.cli-upgrade-link": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/2726",
"updatedirectory": "\/nc-updater",
"maintenance_window_start": 100,
"allow_local_remote_servers": true,
"davstorage.request_timeout": 3600,
"documentation_url.server_logs": "https:\/\/github.com\/nextcloud\/all-in-one\/discussions\/5425",
"htaccess.RewriteBase": "\/",
"dbpersistent": false,
"auth.bruteforce.protection.enabled": true,
"ratelimit.protection.enabled": true,
"files_external_allow_create_new_local": false,
"trusted_proxies": "***REMOVED SENSITIVE VALUE***",
"config_preset": 3,
"app_install_overwrite": [
"ransomware_protection"
],
"mail_smtpauth": true,
"mail_sendmailmode": "smtp",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "587"
}
}List of activated Apps
Enabled:
- activity: 5.0.0-dev.0
- admin_audit: 1.22.0
- bruteforcesettings: 5.0.0-dev.0
- calendar: 6.1.5
- circles: 32.0.0
- cloud_federation_api: 1.16.0
- comments: 1.22.0
- contactsinteraction: 1.13.1
- dashboard: 7.12.0
- dav: 1.34.2
- dav_push: 1.0.0
- deck: 1.16.3
- encryption: 2.20.0
- event_update_notification: 2.8.0
- external: 7.0.0
- federatedfilesharing: 1.22.0
- files: 2.4.0
- files_antivirus: 6.1.0
- files_downloadlimit: 5.0.0-dev.0
- files_fulltextsearch: 32.0.2
- files_pdfviewer: 5.0.0-dev.0
- files_reminders: 1.5.0
- files_sharing: 1.24.1
- files_trashbin: 1.22.0
- files_versions: 1.25.0
- firstrunwizard: 5.0.0-dev.0
- forms: 5.2.4
- fulltextsearch: 32.0.0
- fulltextsearch_elasticsearch: 32.0.2
- groupfolders: 20.1.9
- guests: 4.6.0
- logreader: 5.0.0-dev.0
- lookup_server_connector: 1.20.0
- nextcloud-aio: 0.8.0
- nextcloud_announcements: 4.0.0-dev.0
- notes: 4.12.4
- notifications: 5.0.0-dev.0
- notify_push: 1.3.0
- oauth2: 1.20.0
- ownershiptransfer: 1.3.0
- password_policy: 4.0.0-dev.0
- polls: 8.6.3
- privacy: 4.0.0-dev.0
- profile: 1.1.0
- provisioning_api: 1.22.0
- quota_warning: 1.23.0
- recommendations: 5.0.0-dev.0
- registration: 2.8.0
- related_resources: 3.0.0-dev.0
- richdocuments: 9.0.2
- serverinfo: 4.0.0-dev.0
- settings: 1.15.1
- spreed: 22.0.8
- support: 4.0.0-dev.0
- systemtags: 1.22.0
- tables: 1.0.3
- text: 6.0.1
- theming: 2.7.0
- twofactor_admin: 4.9.0
- twofactor_backupcodes: 1.21.0
- twofactor_nextcloud_notification: 6.0.0-dev.0
- twofactor_totp: 14.0.0
- updatenotification: 1.22.0
- uppush: 2.3.1
- user_status: 1.12.0
- viewer: 5.0.0-dev.0
- webhook_listeners: 1.3.0
- whiteboard: 1.5.3
- workflowengine: 2.14.0
Disabled:
- announcementcenter: 7.3.0 (installed 7.3.0)
- app_api: 32.0.0 (installed 32.0.0)
- contacts: 8.3.0 (installed 8.3.0)
- federation: 1.22.0 (installed 1.22.0)
- files_external: 1.24.0
- maps: 1.6.0 (installed 1.6.0)
- photos: 5.0.0-dev.1 (installed 5.0.0-dev.1)
- ransomware_protection: 1.14.0 (installed 1.14.0)
- sharebymail: 1.22.0 (installed 1.22.0)
- survey_client: 4.0.0-dev.0 (installed 4.0.0-dev.0)
- suspicious_login: 10.0.0-dev.0
- user_ldap: 1.23.0
- weather_status: 1.12.0 (installed 1.12.0)Nextcloud Signing status
No errors have been found.Nextcloud Logs
{"reqId":"9Db451D8jQ88s5BsbC20","level":3,"time":"2026-01-27T15:53:32+00:00","remoteAddr":"82.126.8.217","user":"username","app":"core","method":"PUT","url":"/remote.php/dav/calendars/username/personal/06E41279-1CD7-4697-868D-54B83D6586F2.ics","scriptName":"/remote.php","message":"Sending mail to \"Array\n(\n [recipient@gmail.com] => Recipient Name\n)\n\" with subject \"Invitation mise \u00e0 jour : R\u00e9union comit\u00e9 de Reunion\" failed","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0","version":"32.0.4.1","exception":{"Exception":"Symfony\\Component\\Mailer\\Exception\\UnexpectedResponseException","Message":"Expected response code \"250\" but got code \"550\", with message \"550 5.7.26 Submission not allowed for messages in which MAIL FROM <administrateur@mydomain.fr> does not match header From <Franck Peyronnet via\".","Code":550,"Trace":[{"file":"/var/www/html/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php","line":186,"function":"assertResponseCode","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport","type":"->","args":["550 5.7.26 Submission not allowed for messages in which MAIL FROM <administrateur@mydomain.fr> does not match header From <Franck Peyronnet via\n",[250]]},{"file":"/var/www/html/3rdparty/symfony/mailer/Transport/Smtp/EsmtpTransport.php","line":118,"function":"executeCommand","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport","type":"->","args":["\r\n.\r\n",[250]]},{"file":"/var/www/html/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php","line":222,"function":"executeCommand","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\EsmtpTransport","type":"->","args":["\r\n.\r\n",[250]]},{"file":"/var/www/html/3rdparty/symfony/mailer/Transport/AbstractTransport.php","line":69,"function":"doSend","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport","type":"->","args":[{"__class__":"Symfony\\Component\\Mailer\\SentMessage"}]},{"file":"/var/www/html/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php","line":137,"function":"send","class":"Symfony\\Component\\Mailer\\Transport\\AbstractTransport","type":"->","args":[{"__class__":"Symfony\\Component\\Mime\\Email"},{"__class__":"Symfony\\Component\\Mailer\\DelayedEnvelope"}]},{"file":"/var/www/html/3rdparty/symfony/mailer/Mailer.php","line":42,"function":"send","class":"Symfony\\Component\\Mailer\\Transport\\Smtp\\SmtpTransport","type":"->","args":[{"__class__":"Symfony\\Component\\Mime\\Email"},"*** sensitive parameters replaced ***"]},{"file":"/var/www/html/lib/private/Mail/Mailer.php","line":205,"function":"send","class":"Symfony\\Component\\Mailer\\Mailer","type":"->","args":[{"__class__":"Symfony\\Component\\Mime\\Email"}]},{"file":"/var/www/html/apps/dav/lib/CalDAV/Schedule/IMipPlugin.php","line":310,"function":"send","class":"OC\\Mail\\Mailer","type":"->","args":[{"__class__":"OC\\Mail\\Message"}]},{"file":"/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"schedule","class":"OCA\\DAV\\CalDAV\\Schedule\\IMipPlugin","type":"->","args":[{"__class__":"Sabre\\VObject\\ITip\\Message","uid":"b4a462f4-fe21-4cac-9193-7d02fa0ab536","component":"VEVENT","method":"REQUEST","sequence":3,"sender":"mailto:usermail@msn.com","senderName":{"__class__":"Sabre\\VObject\\Parameter","parent":"*** sensitive parameters replaced ***","name":"CN","noName":false},"recipient":"mailto:recipient@gmail.com","recipientName":"Recipient Name","scheduleStatus":"1.2;Message delivered locally","message":{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},"significantChange":true}]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/CalDAV/Schedule/Plugin.php","line":351,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["schedule",[{"__class__":"Sabre\\VObject\\ITip\\Message","uid":"b4a462f4-fe21-4cac-9193-7d02fa0ab536","component":"VEVENT","method":"REQUEST","sequence":3,"sender":"mailto:usermail@msn.com","senderName":{"__class__":"Sabre\\VObject\\Parameter","parent":"*** sensitive parameters replaced ***","name":"CN","noName":false},"recipient":"mailto:recipient@gmail.com","recipientName":"Recipient Name","scheduleStatus":"1.2;Message delivered locally","message":{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},"significantChange":true}]]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/CalDAV/Schedule/Plugin.php","line":627,"function":"deliver","class":"Sabre\\CalDAV\\Schedule\\Plugin","type":"->","args":[{"__class__":"Sabre\\VObject\\ITip\\Message","uid":"b4a462f4-fe21-4cac-9193-7d02fa0ab536","component":"VEVENT","method":"REQUEST","sequence":3,"sender":"mailto:usermail@msn.com","senderName":{"__class__":"Sabre\\VObject\\Parameter","parent":"*** sensitive parameters replaced ***","name":"CN","noName":false},"recipient":"mailto:recipient@gmail.com","recipientName":"Recipient Name","scheduleStatus":"1.2;Message delivered locally","message":{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},"significantChange":true}]},{"file":"/var/www/html/apps/dav/lib/CalDAV/Schedule/Plugin.php","line":199,"function":"processICalendarChange","class":"Sabre\\CalDAV\\Schedule\\Plugin","type":"->","args":[{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},["mailto:usermail@msn.com","/remote.php/dav/principals/users/username/"],[],true]},{"file":"/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"calendarObjectChange","class":"OCA\\DAV\\CalDAV\\Schedule\\Plugin","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"},{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},"calendars/username/personal",true,false]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/CalDAV/Plugin.php","line":889,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["calendarObjectChange",[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"},{"__class__":"Sabre\\VObject\\Component\\VCalendar","parent":"*** sensitive parameters replaced ***","name":"VCALENDAR"},"calendars/username/personal",true,"And 1 more entries, set log level to debug to see all entries"]]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/CalDAV/Plugin.php","line":733,"function":"validateICalendar","class":"Sabre\\CalDAV\\Plugin","type":"->","args":["*** sensitive parameters replaced ***","*** sensitive parameters replaced ***",false,{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"},false]},{"file":"/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"beforeWriteContent","class":"Sabre\\CalDAV\\Plugin","type":"->","args":["*** sensitive parameters replaced ***",{"__class__":"OCA\\DAV\\CalDAV\\CalendarObject"},"*** sensitive parameters replaced ***",false]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php","line":1133,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["beforeWriteContent",["*** sensitive parameters replaced ***",{"__class__":"OCA\\DAV\\CalDAV\\CalendarObject"},"*** sensitive parameters replaced ***",false]]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":492,"function":"updateFile","class":"Sabre\\DAV\\Server","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/html/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/html/3rdparty/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->","args":["method:PUT",[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]]},{"file":"/var/www/html/apps/dav/lib/Connector/Sabre/Server.php","line":211,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->","args":[{"__class__":"Sabre\\HTTP\\Request"},{"__class__":"Sabre\\HTTP\\Response"}]},{"file":"/var/www/html/apps/dav/lib/Server.php","line":424,"function":"start","class":"OCA\\DAV\\Connector\\Sabre\\Server","type":"->","args":[]},{"file":"/var/www/html/apps/dav/appinfo/v2/remote.php","line":22,"function":"exec","class":"OCA\\DAV\\Server","type":"->","args":[]},{"file":"/var/www/html/remote.php","line":151,"args":["/var/www/html/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/html/3rdparty/symfony/mailer/Transport/Smtp/SmtpTransport.php","Line":327,"message":"Sending mail to \"Array\n(\n [recipient@gmail.com] => Recipient Name\n)\n\" with subject \"Invitation mise \u00e0 jour : R\u00e9union comit\u00e9 de Reunion\" failed","exception":{},"CustomMessage":"Sending mail to \"Array\n(\n [recipient@gmail.com] => Recipient Name\n)\n\" with subject \"Invitation mise \u00e0 jour : R\u00e9union comit\u00e9 de Reunion\" failed"}}
{"reqId":"9Db451D8jQ88s5BsbC20","level":3,"time":"2026-01-27T15:53:32+00:00","remoteAddr":"82.126.8.217","user":"username","app":"dav","method":"PUT","url":"/remote.php/dav/calendars/username/personal/06E41279-1CD7-4697-868D-54B83D6586F2.ics","scriptName":"/remote.php","message":"Unable to deliver message to recipient@gmail.com","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0","version":"32.0.4.1","data":{"app":"dav"}}Additional info
No response