I am seeing a strange issue where I can send and receive mail between mailboxes in the same domain, but forwarding results in an access denied error.
E.g., postmaster@ThatOneDomain.com can exchange email with admin@ThatOneDomain.com (and vice versa), but if I set a forward in SOGo - using either a filter or using the actual forward function - the forwarded messages are denied; e.g.,
Mar 20 07:47:09 localhost ae4b7dfdd6e5[2071]: Mar 20 07:47:09 ae4b7dfdd6e5 postfix/sogo/smtpd[387]: NOQUEUE: reject: RCPT from mailcowdockerized-dovecot-mailcow-1.mailcowdockerized_mailcow-network[fd4d:6169:6c63:6f77::b]: 554 5.7.1 <mailcowdockerized-dovecot-mailcow-1.mailcowdockerized_mailcow-network[fd4d:6169:6c63:6f77::b]>: Client host rejected: Access denied; from=<postmaster@thatonedomain.com> to=<admin@thatonedomain.com> proto=ESMTP helo=<97676f1d900e>
Any suggestions? I feel like I’m missing something obvious…