Category: Spam/Antispam

Use DMARC to harden SPF and DKIM
article #1255, updated 86 days ago

The following TXT record:

v=DMARC1;p=reject;pct=100;p=reject;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.

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How to Check Spam Blacklists (RBLs)
article #241, updated 2101 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.

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