Addition email server logs:
When sending from @mydomain.coop with successful delivery:
{
"ts": 1751965332978,
"type": "delivered",
"direction": "outbound",
"uuid": "425FB09B-28B2-4DFD-B19D-24763E77D8A5.1.1",
"messageId": "<bc8821b5-e1c3-422c-bce0-3be7ae6b974b@mydomain.coop>",
"mailFrom": "<someone@mydomain.coop>",
"spamStatus": null,
"mailbox": null,
"quotaPercent": null,
"rcptTo": [
"<some.person@gmail.com>"
],
"server": {
"host": "149.28.215.223",
"ip": "149.28.215.223",
"port": 587
},
"response": "OK: message queued"
}
When sending from an external address to the same list and failing on the same recipient:
{
"ts": 1751964710037,
"type": "bounce",
"direction": "outbound",
"uuid": "4C06313B-F1B3-460A-AC38-59402F3C3ACE.1.1",
"messageId": "<76622dc4-1d22-4fe3-a863-e5da6a39a0b8@posteo.net>",
"mailFrom": "<someone@posteo.net>",
"spamStatus": null,
"mailbox": null,
"quotaPercent": null,
"rcptTo": [
"<some.person@gmail.com>"
],
"message": "550 From header must end with @mydomain.coop",
"mx": {
"exchange": "149.28.215.223",
"priority": 0,
"port": 587,
"auth_user": "*@mydomain.coop",
"auth_pass": "c3b478557ae86e1b599aba64",
"auth_type": "plain",
"bind_helo": "my.domain.coop",
"from_dns": "smtp.forwardemail.net"
}
}