Hi!
I have a totaly fresh installation of mailcow, its fine to send mail in and out BUT if there is an attachment mail gets sent from user mailbox but not deliverd to receiver, mail is gone. suggestions?
Same issue when a user forwards email with anything or they have a signatur in the mail. When mail is send out its gone.

    ajnadox fresh installation of mailcow,

    on what?

    ajnadox mail gets sent from user mailbox

    via relay service or direct?

          Have something to say?

          Join the community by quickly registering to participate in this discussion. We'd like to see you joining our great moo-community!

          esackbauer
          I’m sorry for to little info , been busy days, on self hosting updated to latest release from today ,Ubuntu 22.04, 32GB 8core had to make relay by mailgun since GCP is blocking 25

            Try sending with different clients (SOGo, Thunderbird, etc)
            Does the same happen when you send to internal addresses?
            Are there any things configured in Mailgun which might have influence on outgoing mails?

              esackbauer We are right now testing on em-client and thunderbird. mail between internal users is no problem, just the mails going outside but as i know mailgun aint filtering outgoing

                Please test also with SOGo.

                  esackbauer its really strange, i tested sogo , windows email clients, pop and imap, with and without attachment on primary domain and secondary domain with accounts on each domain, no problem at all.

                  Switched to iphone and mac email clients, if mailing from secondary domain on POP account, emails with attachments are blocked IF dmarc policy is set to reject. if i set it to none it passes
                  see log from mailgun.

                  "flags": {
                  "is-authenticated": true,
                  "is-routed": false,
                  "is-test-mode": false,
                  "is-system-test": false
                  },
                  "campaigns": [],
                  "delivery-status": {
                  "code": 550,
                  "enhanced-code": "5.7.26",
                  "tls": true,
                  "session-seconds": 1.232,
                  "utf8": true,
                  "certificate-verified": true,
                  "attempt-no": 1,
                  "description": "",
                  "message": "5.7.26 Unauthenticated email from xxxxxx.nu is not accepted due to domain's\n5.7.26 DMARC policy. Please contact the administrator of xxxxxx.nu domain if\n5.7.26 this was a legitimate mail. To learn about the DMARC initiative, go\n5.7.26 to\n5.7.26 https://support.google.com/mail/?p=DmarcRejection k1-20020a2e9201000000b002d0a10cfbc7si634246ljg.255 - gsmtp",
                  "mx-host": "aspmx.l.google.com"
                  },
                  "envelope": {
                  "transport": "smtp",

                    No one is typing