On 12/04/2017 06:47 PM, Lyndon Nerenberg wrote:
Last week we found out that Helpscout sends email from AWS servers.
Thank you, Helpscout, for forcing me to lift the AWS blocks on my incoming
MTAs, that were cutting down my incoming spam scanning load by a factor of two.
At least.
If I may make a suggestion: rate-limit incoming connections from AWS,
with a pinhole for Helpscout. Spammers try only one if they are doing
direct SMTP; legit mail servers will retry failed transmissions.
I used to do this with Postfix at the edge of a Web host network.
(Yes, yes, I know that compromised PHP scripts will inject mail into a
real mail server, so rate-limiting only spreads out the pain.)
