29 Sep
2009
29 Sep
'09
12:03 a.m.
Bowie Bailey wrote:
Joseph L. Casale wrote:
- I use backup mx's, my current solution probably could work in this scenario but
the support mechanism behind it is *very* weak and I can't get a perfect setup working. Spam hits the primary for a domain, gets blocked and then tries my secondary which sometimes accepts it, after which the primary always accepts from the secondary.
If you have a secondary mx, it MUST have the same (if not more aggressive) spam prevention as your primary for this exact reason. You also need to make sure that the secondary can reject mail for non-existent users so you don't send backscatter when the primary rejects the mail.
Personally I'd just drop the secondary mx completely and let the sending smtp server queue the mail whenever you're offline. Makes life a lot simpler.