I brought this issue up a few weeks ago on the bugs forum - but no answer. I will now assume that the intermittent SMTP error I get when trying to send mail through Group Office is a bug in the software.
The error is...
Failed sending the mail. SMTP Error: The following recipients failed: firstname.lastname@example.org
If I go to the email account settings and change from POP to IMAP and back again - it sends out mail if I log out and log back in the error comes back.
Is there a fix for this please?