Yes we use a reverse DNS look up - if it's not a valid domain then we will block it straight away.
Wed, 7 Jan, 2015 at 10:08 AM
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 the serv...
Wed, 7 Jan, 2015 at 10:12 AM
Restrictions - A maximum of 60 individual connections each 3 minutes, per relay server. - Per connection you may send 30 e-mails in 3 m...
Mon, 12 Dec, 2016 at 3:55 PM
Can you please tell me what the retry period is for deferred mail? i.e. How frequently / at what interval will the service try to redeliver the inbound messages?
The retry period is about 5 minutes, then it goes to 15 minutes after 2 hours.
Wed, 7 Jan, 2015 at 11:28 AM
My emails have bounced due to one of your servers becoming blacklisted. Do I have to resend all these emails?
Yes. Once permanently rejected neither incoming nor outgoing messages will not be delivered again automatically. This also applies to the Continuity Service...
Wed, 7 Jan, 2015 at 11:30 AM
PROBLEM: Microsoft Exchange server prompts the error '452 4.3.1 Insufficient system resources' message in the control panel. ENVIRONMENT: Mi...
Fri, 19 Oct, 2018 at 2:36 PM