I’m new here 🙂 I have been using mailcow since 2 weeks. Generally everything works well. I can send mails by Sogo, Mailtester gives me 10/10 note. But i have problems with my MyBB forum and sending mails (ex. registration mails) with smtp by forum engine. Sometimes mails are sent well without any errors, sometimes mails are sent with error in forum log - “Mail may not be delivered. Reason: N/A” but the mail reaches the addressee and i havent errors in mailcow logs (postfix, raspamd etc.). Sometimes mails aren’t sent with error in forum log - “The mail server is not ready, it did not respond with a 220 status message”, but no errors in mailcow logs. I haven’t found any rule it happens randomly. I test it on my gmail account and mailcow account. Sometimes mails are sent and sometimes not.
My MyBB SMTP conf:
Smtp host: mail.myhost.com
stmp login: firstname.lastname@example.org
port: 587 with TLS secure
When I use SoGo webmail (in mailcow) e-mails always are sent.
Previously I used external mail account on hosting, and my forum sent mail by smtp and i hadn’t any errors.
Can you help me?