On 9/3/07, Joe Abley
On 2-Sep-2007, at 1546, Bojan Zdrnja wrote:
Please tell us that both [A] and [B] know all your users and domains (in other words: they reject e-mails for non existent users during the SMTP session).
[A] and [B] are networks, not mail servers.
Networks? So what do they have to do with MX records and multiple servers then? If your MTA in [A] is contactable through [B]'s network then you are fine with having just one MTA. Or I'm missing something ...
If not, I would say that [B] causes more problems for the world than it helps you because it probably generates zillion bounces per day ...
I suspect the world has greater things to worry about than how I manage the servers which handle my own mail.
Of course .. unless a spammer decides to do a dictionary attack on your domain and sends 100 million e-mails (of which all are to non existent user but that one going to you) and then your server send 100 million - 1 NDRs back. I see absolutely no reason why one would have multiple MX servers today at different networks. Multiple MTAs of course (preferably load balanced) but multiple MX servers - I see no real benefit. Add to that the fact that 90% of spammers hit MX servers with higher number *first* thinking that they won't have any spam filtering (and in most cases they are correct). Cheers, Bojan Bojan