Delivery Temporarily Suspended Unknown Mail Transport Error Postfix Upd

dovecot unix - n n - - pipe flags=DRhu user=vmail argv=/usr/libexec/dovecot/dovecot-lda -f $sender -d $user@$domain -o plugin/quota=maildir:User quota -d

Postfix will try to connect, fail, and generate the "unknown mail transport error." dovecot unix - n n - - pipe

Logs show queue file write error or insufficient disk space . The Fix: Check your disk space: df -h Check your inode usage: df -i dovecot unix - n n - - pipe

Run the built-in Postfix check tool to find immediate syntax errors in your configuration files: postfix check Use code with caution. Copied to clipboard dovecot unix - n n - - pipe

Based on the specific phrasing "delivery temporarily suspended," the likely causes are:

If you make any changes to this file, you recompile the database lookup table: postmap /etc/postfix/transport Use code with caution.