Sender Score Low
Rocco The Taco asked: We host our own email server and have discovered we have a low sending score that is causing delivery issues. From the report (senderscore.org), there is …
How to add Amazon's X-SES-CONFIGURATION-SET:ConfigSet to a my postfix mail server?
needtoknow asked: Amazon shows an example on how to add their X-SES-CONFIGURATION-SET:ConfigSet to a single email. How do I add this to my postfix configuration so it uses it for …
550 No RDNS entry for my ip (in reply to RCPT TO command)
Pedro Frazão asked: Some recipients are making RDNS verification to my mail server and being refused. I have a CentOS VPS with my website and mail server for my business. …
Received-SPF: neutral
Ed H. asked: When I send emails from my application I am getting a spf neutral error. I have been working with Google and my hosting company, but none of …
Which side of this SMTP conversation is correct?
Mike B asked: I have an odd scenario with two mail servers communicating with one another and need help determining which one is behaving correctly. It’s a little complicated to …
PTR record/rDNS for mail server considered "generic" or a "dynamic IP"
Sefam asked: I’m currently trying to figure out how to configure my rDNS to be SpamAssassin friendly. SpamAssassin’s documentation only seems to provide the following; https://wiki.apache.org/spamassassin/Rules/CK_HELO_DYNAMIC_SPLIT_IP “The HELO appeared to …
Postfix SMTP Authentication Failed
nikolas asked: I’ve configure postfix for mandrill as follows in /etc/postfix/sasl_passwd [smtp.mandrillapp.com]:587 myusername:apikey then ran postmap /etc/postfix/sasl_passwd In /etc/postfix/main.cf I added myhostname = webmail.mysite.com mydestination = localhost smtp_sasl_auth_enable = yes …
Multiple mail servers and reverse DNS
leeeennyy asked: If I have three mail servers MS1, MS2 and MS3 all with different IPs but share the same domain name (exampledomain.com) and I use an SPF record to …
Bypass Postfix 'reject_unknown_client_hostname' for authenticated SMTP clients
tcdaly asked: In my postfix configuration, I’ve switched on smtpd_client_restrictions = reject_unknown_client_hostname as an anti-spam measure. However, sometimes I fall foul of this myself when I make an authenticated SMTP …
Sending malicious email as a test
Orphans asked: I have set up a working SMTP relay together with MailScanner. This SMTP relay is not — and will not be — able to relay email from the …