551 not our customer when forwarding mail outlook

[MLV0764]

I get returned mail with the error "551 not our customer" when trying to
forward mail. I can send new mail to the same contacts with no problem.

 

[problemcat]

I get returned mail with the error "551 not our customer" when trying
to
forward mail. I can send new mail to the same contacts with no
problem.

I'm having the same problem. It just started yesterday.

 

[Milton]

I am generally having the same problem. I can send new emails, reply to fully opened emails and forward emails. When I reply from a not opened email, I get error 551 'user not a customer'. Help?

 

[ladydi]

I am having the same prob and when I tried to call for help they want $49
bucks.... half of my contacts no longer appear and I cannot even send them a
NEW mail ...undeliverable and that not our customer/551 comes up. ARRRGH! Has
Outlook crashed?

 

[etailgifts]

Same Problem started yesterday, now I can't send any emails and the addresses do not automatically pop up, even after restart and outlook repair/update. Is there an iphone app to blame? I used a linked-in iphone app update yesterday and believe it may have duplicated some addresses.

 

[Gary]

Same problem here. Started yesterday, 4/19/10. Newly created e-mail go out but not fwd or reply. Is it an Outlook or ISP issue. Happens with both Outlook XP om an XP machime and Outlook 07 on a Vista machine. I use BellSouth, ie.e AT&T DSL.

 

[ladydi]

Same problem here. Started yesterday, 4/19/10. Newly created e-mail g
out but not fwd or reply. Is it an Outlook or ISP issue. Happens wit
both Outlook XP om an XP machime and Outlook 07 on a Vista machine.
use BellSouth, ie.e AT&T DSL.

Mine started last night...so same time. Many of my contacts are gon
and I tried a new email to a few and it refuses to send ...just get tha
same not a customer/551 ...VERY frustrating...I can't even forward.
updated the returned email addresses in my contacts AND had them send m
a mail so I could add it...and still will not allow me to mail the
back???
Wonder if a auto-Vista update crashed 2007 Outlook? I have not added o
updated anything before this happened

 

[Fred Bailey]

I am havinfg the same problem in reply or forward.

 

[Robin]

I'm having a simular issue.
outlook 2002 will not allow me to send mail get error message 551 not our
customer
I am able to receive all e-mails from other hosts but I am not able to reply
or send new mail if they do not have the same e-mail provider.

Can I get help!!

 

[Robin]

I'm having a simular issue.
outlook 2002 will not allow me to send mail get error message 551 not our
customer
I am able to receive all e-mails from other hosts but I am not able to reply
or send new mail if they do not have the same e-mail provider.
I am also using BELLSOUTH
Can I get help!!

 

[Robin]

Are you all using BELLSOUTH.NET ????????

I'm having a simular issue.
outlook 2002 will not allow me to send mail get error message 551 not our
customer
I am able to receive all e-mails from other hosts but I am not able to reply
or send new mail if they do not have the same e-mail provider.

Can I get help!!

 

[hydrajor]

I am havinfg the same problem in reply or forward.

We are on AT&T (Bellsouth). Also having the problem on both my
computer with XP and my wife's laptop with Vista when sending through
Outlook. Emails to other AT&T customers and certain other ISPs send with
no problem, but most emails get that same "551 not our customer"
message. When we send email directly through AT&T's webmail it appears
to send but does not show up in "Sent" file. Have not received any
replies yet to indicate recipients are getting the emails.

 

[Reenie McC]

I am using bellsouth.net, and having exactly the same problem - can't reply
to messages, and losing email addresses. It started this morning - Feb. 20.

Does anyone have a hint how to fix it?

 

[Robin]

Must be a problem with bellsouth!@! I guess I'll wait for it to clear it up

 

[Pride PC]

I suspect it's another wave of trying to "persuade" us to use the yahoo mail server config, which never seemed to work right when I set it up in Outlook using their spec. I have been staying on the mail.bellsouth.net server. Since last night I've had the 551 error when sending any mail, reply forward or new, to a non-bellsouth.net address

 

[Ashley Franco]

ditto, My wife's laptop is on VITSA running Outlook 2007 with ISP = Bellsouth. No replies from Bellsouth.

 

[AlabasterDavid]

Same thing here. Started this morning. Using Bellsouth.net as m
outgoing mail server. Use Outlook at home and auto download my email
from Bellsouth.net and yahoo.com. But today, i can't forward or send an
email messages, only recieve. Getting the sam message you are.

 

[scotth67]

I have also had the same issue on Bellsouth. It worked Friday night (2/19/10) but not today. I checked settings and tried webmail (which works) but stumbled upon a page that said Bellsouth would not let me check or change any information on my account because their servers were down for maintenance. Anyone else tried that route? I really think it is Bellsouth/AT&T doing something to fix something that wasn't really broken.

 

[paldan]

551 not our customer

 

[etailgifts]

Seems to be working now using (mail.bellsouth.net) email server, additional outbound servers and bellsouth/AT&T DSL service. NO more immediate bounce back.