I'm sure there are other Postfix sites which have looked into the question of what is required for Everbridge email to come in without potential delays or non-delivery.
I'm asking someone working with our contact at Everbridge for a list of IPs which are used on their end, as I've found there are DNS issues and greylisting flagged one of their SMTP for not re-connecting within 24 hours. There is also the rate limit we'd like to exempt for their IPs. I can whitelist their IPs in sqlgreylist and in check_client_access hash:/etc/postfix/access as well as the DNSRBL. I'm not aware we can introduce exemptions for smtpd_client_connection_rate_limit smtpd_client_message_rate_limit If anyone has already tweaked Postfix to accommodate the Everbridge alert system, do you want to share what helped?
