General FAQs
Yes we use a reverse DNS look up - if it's not a valid domain then we will block it straight away.
Thu, 21 Nov, 2019 at 4:38 PM
When the target server responds to a "telnet“ on port 25 (SMTP), the command "ehlo“ is used to prove whether TLS is possible or not. When...
Thu, 21 Nov, 2019 at 4:38 PM
RESTRICTIONS - A maximum of 60 individual connections each 3 minutes, per relay server. - Per connection you may send 30 e-mails in 3 minutes ...
Thu, 21 Nov, 2019 at 4:37 PM
The retry period is about 5 minutes, then it goes to 15 minutes after 2 hours.
Thu, 21 Nov, 2019 at 4:36 PM
Yes. Once permanently rejected neither incoming nor outgoing messages will not be delivered again automatically. This also applies to the Continuit...
Thu, 21 Nov, 2019 at 4:35 PM
PROBLEM: Microsoft Exchange server prompts the error '452 4.3.1 Insufficient system resources' message in the control panel. ENVIRON...
Thu, 21 Nov, 2019 at 4:35 PM