[CentOS] Sendmail not working

Sun Apr 19 16:43:00 UTC 2020
Frank Cox <theatre at sasktel.net>

On Sun, 19 Apr 2020 10:28:54 -0600
S.Bob wrote:

> <sbob at quadratum-braccas.com>
>      (reason: 554 5.7.1 Service unavailable; Client host [] 
> blocked using xbl.spamhaus.org.rbl.local; https://www.spamhaus
> .org/query/ip/

Your ip address ( is being blocked by the email server that you're sending the message to (quadratum-braccas.com).  It's nothing to do with sendmail or your own email setup; the folks on the other end don't want to receive your email so they are rejecting it.

MELVILLE THEATRE ~ Real D 3D Digital Cinema ~ www.melvilletheatre.com