On 09/24/2017 10:54 AM, Davide Marchi wrote:
*David Jones wrote:*
I tried using tarbaby.junkemailfilter.com as my highest/third MX and
ran into delivery problems due to greylisting. MTAs will back off and
retry at different intervals which can cause very long delays with
greylisting.
Look at the MX records for ena.com. My smtp2.ena.net _always_ temp
fails everything which is attacked by spammers and bots. smtp.ena.net
has mutliple A records to load balance across two different data
centers. This has worked very well with greylisting so if you can
rethink your A records behind the MX records, then I would recommend
going that route like I did.
# dig ena.com mx +short
10 smtp.ena.net.
20 smtp2.ena.net.
# dig smtp.ena.net +short
96.5.1.4
96.4.1.4
and then:
If both servers are setup identically, just make 2 A records like
smtp.ena.net above and use them in an active/active DNS load-balanced
way rather than as a backup MX. Backup MX'es are used in a very
specific way that you probably don't need based on the added complexity.
What is the MTA you are using?
Postfix 2.11.3
You could script some postconf commands on the secondary (higher
priority) MX to temp fail everything until the primary is unavailable
then adjust/reload default configs from the primary server to start
accepting mail.
This is not clear for me: what do you mean (and eventually how do it)
for: "script some postconf commands on the secondary (higher priority)
MX to temp fail everything until the primary is unavailable then
adjust/reload default configs from the primary server to start accepting
mail"?
Thanks!
If this is too much, then perhaps it's not the needed solution.
If you do this, then you need to make sure the secondary servers are
setup identically to the primary to filter identically.
the two setup are identically.
As mentioned above, just use them in an active/active way like
smtp.ena.net. If this is for msw.it:
# dig msw.it mx +short
5 posta.msw.it.
10 posta2.msw.it.
# dig posta.msw.it +short
88.33.124.107
# dig posta2.msw.it +short
77.43.50.11
Change the posta2 A record to just posta and delete the 10 MX record so
it would look like this:
# dig msw.it mx +short
5 posta.msw.it.
# dig posta.msw.it +short
88.33.124.107
77.43.50.11
--
David Jones
