US Telco Support → AT&T → AT&T DSL > ATT blocking email clients 5.5.4 invalid argument

ATT blocking email clients 5.5.4 invalid argument

I have DSL since 2003 and both sbcglobal.net and att.net POP/SMTP email addresses.
In ATT's notice re: webmail change, no mention of blocking email clients. I can receive, but cannot send. SMTP server returns 5.5.4 Invalid Argument.

In Chat, ATT rep told me ATT had blocked email client use. Then he offered to remotely view my screen. So why would looking at my screen help ME if ATT is blocking email clients?

It would not.

Last year, I tried to save family member's sbcglobal.net address, which had been connected to their Uverse account, which got turned off for a week while they were ill. 10 years of email gone, because ATT "can't find" the software to access the sbcglobal.net accounts. No warning. We didn't want sbcglobal.net email attached to the Uverse account, and certainly were not informed that the email account would be deleted if Uverse was disconnected, even voluntarily. ATT paid a Uverse technician for 6 hours while we sat on the phone trying to get it back.

from att email 05.08.2013:
"There is no impact to your email IDs, saved messages, webmail folders, passwords, email client settings, or service, based on this upgrade."

I praise my intuition for setting up a private (as such) POP/SMTP email account to replace my att accounts two weeks ago, but had not begun using it yet.

They desperately try to control customers which only drives them away faster.

I have never used BSo/ATT mail EVER. And still works fine. What they do block is the standard SMTP port 80? so you need to set the client to use an alternate port for sending.
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Not happening here:

C:\util\dig>telnet smtp.att.yahoo.com 25
Connecting To smtp.att.yahoo.com...
220 smtp.att.yahoo.com ESMTP ready
helo reki.aosake.net
250 smtp.att.yahoo.com
quit
221 2.0.0 Bye
 
Connection to host lost.
 

C:\util\dig>nslookup reki.aosake.net
Server:  ordns.he.net
Address:  2001:470:20::2
 
Non-authoritative answer:
Name:    reki.aosake.net
Address:  173.228.7.217
 

AT&T Yahoo! in Thunderbird

[13:38:22.43] 1b74   Mail:      SMTP [rx] 220 smtp.mail.yahoo.com ESMTP ready
[13:38:22.49] 1b74   Mail:      SMTP [tx] EHLO Miyuki
[13:38:22.61] 1b74   Mail:      SMTP [rx] 250-smtp.mail.yahoo.com
[13:38:22.61] 1b74   Mail:      SMTP [rx] 250-PIPELINING
[13:38:22.61] 1b74   Mail:      SMTP [rx] 250-SIZE 41697280
[13:38:22.61] 1b74   Mail:      SMTP [rx] 250-8 BITMIME
[13:38:22.61] 1b74   Mail:      SMTP [rx] 250 AUTH PLAIN LOGIN XYMCOOKIE
[13:38:22.61] 1b74   Mail:  Zone_MailChk ERROR: (sicily.cpp:695), failed with 0x8000FFFF  
[13:38:22.61] 1b74   Mail:      SMTP [tx] AUTH LOGIN
[13:38:22.74] 1b74   Mail:      SMTP [rx] 334 VXNlcm5hbWU6
[13:38:22.74] 1b74   Mail:      SMTP [tx] dC5zYWthZ2FtaUBhdHQubmV0
[13:38:22.87] 1b74   Mail:      SMTP [rx] 334 UGFzc3dvcmQ6
[13:38:22.87] 1b74   Mail:      SMTP [tx] YUNZN3FsSzhXT3VLTk5EUDJQ
[13:38:23.24] 1b74   Mail:      SMTP [rx] 235 2.0.0 OK
[13:38:23.25] 1b74   Mail:      SMTP [tx] MAIL FROM: <**********@att.net>
[13:38:23.36] 1b74   Mail:      SMTP [rx] 250 OK , completed
[13:38:23.36] 1b74   Mail:      SMTP [tx] RCPT TO: <**********@netscape.net>
[13:38:23.48] 1b74   Mail:      SMTP [rx] 250 OK , completed
[13:38:23.48] 1b74   Mail:      SMTP [tx] DATA
[13:38:23.61] 1b74   Mail:      SMTP [rx] 354 Start Mail. End with CRLF.CRLF
[13:38:23.62] 1b74   Mail:      SMTP [tx] .
[13:38:24.06] 1b74   Mail:      SMTP [rx] 250 OK , completed
[13:38:24.06] 1b74   Mail:      SMTP [tx] QUIT