<p>Does username and/or password have some special characters (non 7bit)?</p><p>bye   Olaf</p><p> </p>

<p>I have Mercury 4.24 set up with about 30 email users. 29 of them work.<span style="font-size: 10pt;"> </span></p><p><span style="font-size: 10pt;">One of them, however, will not authenticate it's username/password combination.</span></p><p><span style="font-size: 10pt;">I have even reinstalled and hand typed the username/password pairing file. The other 29 work.</span></p><p><span style="font-size: 10pt;">The one is in the middle of a list where all are in the same format. It simply WILL NOT AUTHENTICATE.</span></p><p><span style="font-size: 10pt;">Not from LOCAL Thunderbird, not from my Samsung Galaxy Tab 3, not from my Samsung cell phone.</span></p><p><span style="font-size: 10pt;">I cannot even add their accounts without getting a failure when it tries to authenticate.</span></p><p><span style="font-size: 10pt;">I have substituted port 587 for port 25, by allowing EITHER to send out AS 587 from my router, and accepting EITHER coming IN, to 587. Seems to be working for all others.</span></p><p><span style="font-size: 10pt;">I have even tried renaming the user from of ****ByCell (asterisks hiding a 4 letter name) to *BC (again, asterisk masking the actual letter)</span></p><p>I have no idea how it is identifying it every single time, enough to block it. It simply says the name/password pair are incorrect.</p><p>Any Ideas? </p>

It's Mercury 4.74, right? Try temporarily switching on session logging in MercuryS to see if the client actually connects and exactly what is sent and received during the session.