"Jeff Thibodeau [MS]" wrote: > Hi Darrell, > > From the Exchange server use telnet and open a connection to itself on port > 25. Type EHLO and view the list of verbs. Makes sure Exchange is > advertising the Auth verb. I am a sysadmin at an ISP, and this is a very common problem for us and we'd *really* like to know how to fix it; as you can see, we *are* advertising AUTH, and outlook *is* configured for "outgoing server requires authentication": 13 10 0.2334 (0.2031) S>C application_data --------------------------------------------------------------- 220 vmail01.peak.org ESMTP Postfix --------------------------------------------------------------- 13 11 0.2343 (0.0009) C>S application_data --------------------------------------------------------------- EHLO xp --------------------------------------------------------------- 13 12 0.2348 (0.0005) S>C application_data --------------------------------------------------------------- 250-vmail01.peak.org 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-AUTH PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN --------------------------------------------------------------- 13 13 0.2372 (0.0023) C>S application_data --------------------------------------------------------------- MAIL FROM: --------------------------------------------------------------- 13 14 0.2381 (0.0008) S>C application_data --------------------------------------------------------------- 250 2.1.0 Ok --------------------------------------------------------------- 13 15 0.2389 (0.0008) C>S application_data --------------------------------------------------------------- RCPT TO: --------------------------------------------------------------- 13 16 0.2396 (0.0007) S>C application_data --------------------------------------------------------------- 554 5.7.1 <cvo-sr1-off.peak.org[69.59.192.10]>: Client host rejected: Access denied ---------------------------------------------------------------
> 250-AUTH PLAIN After some experimentation, I determined that outlook requires the LOGIN auth mechanism; with PLAIN, it just silently doesn't authenticate, even when told the server requires it.
