It may be time to crank up debug level on Postfix or do tcpdump capture to see what you are sending over the wire when it works and when it doesn't ?
-ANGELO FAZZINA ang...@uconn.edu University of Connecticut, ITS, SSG, Server Systems 860-486-9075 -----Original Message----- From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> On Behalf Of Michael Sent: Tuesday, January 15, 2019 2:48 PM To: postfix-users@postfix.org Subject: Re: New SASL error when relaying through gmail On 1/14/19 11:19 AM, Wietse Venema wrote: > The 'invalid parameter supplied' is an error message the local SASL > library. This error happens while Postfix prepares to send the AUTH > command. > > Why does the Cyrus SASL library return 'invalid parameter supplied'? > I can only speculate that it does not like something about the SASL > mechanism list (which Postfix got from the Gmail server), or something > about the username or password (which it got from local file). > > It would be worthwhile to see the AUTH parameter in the server's > EHLO response before and after Postfix sends STARTTLS. > > Wietse Thanks Wietse, Using Angelo's testing methodology, I can see this: 250-smtp.gmail.com at your service, [68.226.113.229] 250-SIZE 35882577 250-8BITMIME 250-AUTH LOGIN PLAIN XOAUTH2 PLAIN-CLIENTTOKEN OAUTHBEARER XOAUTH 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-CHUNKING 250 SMTPUTF8 I am not sure how to check from postfix. Michael
