Use this to skip SMTP max message size checking if SMTP Authentication has been used. This option can be used per domain also.
To globally enable this feature:
- Select Setup
- Select Default Domains / Servers

- Select Servers
- Check ...refuses messages which are not RFC compliant
- Enter a value, in KB, for ...refuses all messages larger than
- Check ...but not if the SMTP session is authenticated under ...refuses all messages larger than X
- Click Apply
- Click OK

Note: The option for ...refuses messages to domain larger than X refers to the default domain.
To enable this feature per domain:
- Select Setup
- Select Domain Manager

- Select the domain in question
- Enter a value, in KB, for Refuses all messages larger than
- Check the box ...but not if the SMTP session is authenticated
- Click Apply
- Click OK

