501 is a "Not Implemented" error.  Is your DNS ok?  Check if you haven't
accidentally wiped /etc/resolv.conf.  If you have, reset it and set
permission to 677 (chmod 677 /etc/resolv.conf)

Suresh Ramasubramanian   [EMAIL PROTECTED]
Juno.Com Postmaster/Abuse Desk, Hyderabad India
     Phone # +(91-40)332-3274  extn 8815

> -----Original Message-----
> From: Dr. Sharukh K. R. Pavri. [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, April 12, 2000 11:21 AM
> To:   linux India
> Subject:      [LIH] returned mails.
> 
> all of a sudden, mails sent from my linux box are bouncing back at me with
> 501 error saying senders name could not be resolved. Previously I was able
> send mails. Please help, cos I'm back to windoze till I can solve this
> problem.  I have made no changes to sendmail at all.
> Suresh, please help,
> 

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