We're getting the following Error when emailing a client.
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <mail.ourdomain.com #5.5.0 smtp;553 mailbox email@example.com is restricted (Mode: normal)>
The SMTP logs aren't much better:
OutboundConnectionResponse SMTPSVC1 ourserver - 25 - 553+mailbox+jwxxx@theirdomain+is+restricted+(Mode:+normal) 0 0 67 0 265 SMTP - - - - OutboundConnectionCommand SMTPSVC1 ourserver - 25 RSET - - 0 0 4 0 265 SMTP - - - -
I believe the error is on their end, but I was curious what the 'is restricted' error message meant. I haven't seen that before, and quick google search didn't return and concrete answers.