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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Cisco fixup for SMTP (Mail Guard)
Thus spake "Shaun Bryant" <[email protected]> > I am currently working on a high volume mail project. The question came up > whether or not the run Cisco's SMTP fixup protocol. I am looking for any > experiences good or bad. Last time I looked, the "mail guard" feature replaces EHLO messages with NOOP (among other things). Some ESMTP-capable mailers figure out what's going on and retry with HELO, but others get confused and end up bouncing all mail going through that path. I don't know who decided EHLO is not a "safe" command, but (a) it's been standard for many, many years, and (b) replacing it with NOOP does not have a "safe" effect. Do not use this feature if you value mail reliability. > Please respond off list Actually, this is far more on-topic than most NANOG drivel, so I'll respond here :) S
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