I've been getting undeliverable emails returned for about a month now. Doesn't matter to who or how the email is worded ect. No reason this should be happening. Anybody with this issue? It's only when sending.
550-5.7.1 [188.8.131.52] Messages missing a valid messageId header are not
550 5.7.1 accepted. x5-20020a056902102500b0066c7dfd760esi19870525ybt.396 -
gsmtp (in reply to end of DATA command
Solved! Go to Solution.