You could set the account status (mailstatus field) to

    readonly

and

g_mailstatus_message state="readonly" message="Large message stuck in outlook, please remove it or contact xxx@yyy.com for assistance"

However, remember most email clients don't bother to show the user the error message when a login fails sadly, so the user is more likely to see an email than this error message.

You would also have to reset the account status manually.

    ChrisP.

2017-05-05 00:29:34.81 [5137367] Rejected 9.1.8.1 <info@domain.tld> <user@gmail.com> 20000813  <099101d2c526$207df340$6179d9c0$@domain.tld> "[.fake_nodots] Message exceeded limit 20000k/20000k g_msg_max";


User is constantly trying to send to big mail(for hours).
Mail has stuck in outlook.

Is there a way to blok/lock user for X minutes and giving user reason why hi can't do smtpauth login and why he was locked.

Regards,
Darko Bazulj