If you’re trying to send mail to an Office 365 recipient and the mail has been rejected because of your sending IP address, follow these steps to submit a delisting request. Error messages may be similar to the following: ECDHE-RSA-AES256-SHA384:256…
Category: Email
Cpanel and Other Ports
Below are listed cPanel and other ports for server administration. cPanel cPanel 2082 cPanel – SSL 2083 WHM 2086 WHM – SSL 2087 Webmail 2095 Webmail – SSL 2096
Check Mail Port Connections with netstat
A good way to check the connectons to mail ports is to use netstat: # netstat -anp | grep :25 tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 2170/master tcp6 0 0 :::25 :::* LISTEN 2170/master # netstat -anp | grep :465…
Adding DKIM to Postfix
DKIM on Postfix: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy The configuration can be tested by sending an empty email to check-auth@verifier.port25.com and a reply will be received. If everything works correctly you should see DKIM check: pass under Summary of Results. ========================================================== Summary of Results…
Email Administration for Postfix , Plesk and Qmail
Basics rDNS (Reverse DNS) The Reverse DNS for an IP should be set to the EHLO value that is sent in the outgoing mail header. This is generally the HostName of the computer. This value should also match the outgoing…
DMARC
Amazonon DMARC (http://sesblog.amazon.com/post/Tx22ZELXSSZRYZR/What-is-DMARC-and-should-you-use-it). This Google article is also helpful: https://support.google.com/a/answer/2466563?hl=en If you scroll down to the ‘Example records’ section, you’ll see a number of examples on how to write the TXT record. Here’s an example of that record: _dmarc.advancedmediawebs.com. 3600…
Change IP route for Blacklist
Add the clean IP to the server. Edit the firewall to NAT all connections FROM port 25 to use the new IP. # iptables -t nat -A POSTROUTING -p tcp –dport 25 -j SNAT –to-source NEW.IPA.DDR.ESS # service iptables save…
SSL for Mail Server Plesk
Normally, checking mail may produce an SSL error for plesk mail services. All clients Outlook, Mac mail, thunderbird, show a a message for ssl certificate. How to fix it. You would need to purchase a SSL certificate for your servers…
Is SpamAssassin Working
Check the header of an email X-Spam-Status: No, score=0.1 X-Spam-Score: 1 X-Spam-Bar: / X-Ham-Report: Spam detection software, running on the system “server.domain.com”, has identified this incoming email as possible spam. The original message has been attached to this so you…
IMAP and POP Email Settings
For a plesk server IMAP Incomming server Server: mail.domain.com Connection security: none Authentication: Password, transmitted insecurely User Name: user@domain.com Port: 143 Outgoing Server: Server: mail.domain.com Connection security: STARTTLS Authentication: Encrypted password User Name: user@domain.com Incomming: Port 587 POP Incomming server…