sysadmin:training
This is an old revision of the document!
SMTP configuration
In order to have a working SMTP server we have to take care of “some” ;) points:
- PTR reverse DNS record:
dig +short ptr <reverse IP>.in-addr.arpa
must give an hostname which DNS A record points to the <IP address> of your server. - DNS:
- MX → who exchange the mail for the domain?
- SPF → which addresses can be originated from the MX?
- DKIM → how are signed messages outgoing from the MX?
- DMARC → what actions do you suggest to mail receivers' providers regarding the conf of SPF/DKIM and where you would like to receive reports from them to tune your mail settings?
- Furthermore we need working antispam and antivirus
- And of course SMTP server only relay local or TLS + authenticated connections
- Need to add DNS entries to the host that receives DMARC reports if domain is different from the one of the DMARC itself
References
SMTP/IMAPs tests
- SPF, DKIM, Antispam: http://dkimvalidator.com send an email to the given address and view results
- DMARC: https://dmarcian.com/
sysadmin/training.1462923920.txt.gz · Last modified: 2016/05/10 23:45 by feroda