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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: OT? /dev/null 5.1.1 email
In message <[email protected]>, Todd Vierling writes: > >The default recommendation I give anyone these days is to use no >secondaries, and let the sender's mail server queue it up, as that's the >fastest implementation path. As a second stage, and only if the expertise >and time is available, then a backup MX with some sort of recipient >validation at SMTP time can be implemented. > The usual justification for a secondary MX is when the MX servers have some sort of special access to the ultimate recipients -- non-SMTP mail delivery, firewalls that they are privileged to pass, etc. --Steven M. Bellovin, http://www.cs.columbia.edu/~smb
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