Category: Spam/Antispam

Use DMARC to harden SPF and DKIM
article #1255, updated 48 days ago

The following TXT record:

v=DMARC1; p=reject; pct=100; adkim=s; aspf=s

at least theoretically, should harden SPF and, if present, DKIM. “=s” means “strict”. According to DMARC documentation, DMARC can be used without DKIM, and experiences with a first setup of the above without DKIM are playing out well so far.

Some info is here:

https://www.dmarcanalyzer.com/how-to-create-a-dmarc-record/

Categories:      

==============

How to Check Spam Blacklists (RBLs)
article #241, updated 2163 days ago

Here is an excellent tool to check if your IP or domain is on a spam blacklist (a.k.a. RBL):

http://mxtoolbox.com/SuperTool.aspx

Type “blacklist:yourdomain.com” for domain checks.

Another is here, IP only:

http://whatismyipaddress.com/blacklist-check

Both check rather large collections of blacklists, as you watch.

Categories: