503 Bad sequence of commands

[vageenadispenser]

I try to send an email to my contacts (over 500) and the i've got this error "503 Bad sequence of commands" and this delivery report:

MaxBulk Mailer Delivery Report [#2] - 31-05-2006
-----------------------------------------------------------------------

Mailer version: 4.4.1-US (42)
Status: Pro - Registered
Machine OS/speed: 10.3.9/1.416Ghz

SMTP server address: my.inbox.com [Port: Default] SSL Off
Authentication: POP (Settings)
Address: my.inbox.com [Port: Default] SSL Off
Streams: 5 [1 Used]
Delivery mode: Bulk (Tag processing OFF)
Groups: 250
Interval: None

Delivery start date: 31-05-2006 at 15:56:54
End date: 31-05-2006 at 15:57:59
Total duration: 1 minute(s), 5 second(s) - Retries: 0/10
Rate: 0,02 recipient(s)/second

to a total of: 1 recipient(s) [1/1]
Sent: 0
Failed: 1 (Bounces not included!)

Mail subject: vageena attack
Mail priority: Normal
Return receipt: No
Mail format: Styled Text [ISO-8859-1]
Mail size: 15 Bytes (Doesn't include attachments)
Attachments: 1 (109,7 KB)
Encoding: Base64

-----------------------------------------------------------------------

i have setup all the pop and smtp server fine so i can't understand what's wrong!

[stanbusk]

Are you sure the POP authentication is the correct one? I mean, have you tried ESMTP?

[vageenadispenser]

i've tried with that one and it worked!
at least with one contact,but i can't send my try to 500 people every time!
thank you

[stanbusk]

If you can't send to all your contacts it is because you have an authentication failure. Look for another error "503 Bad sequence of commands". You should find a relying error