I can send normal emails to him.  I'm pretty sure that it is his
firewall.  I just want everything covered before I start putting the
issue on another IT department.

Russell W. Leighton, Jr.
American Association for Respiratory Care
IT Coordinator
9425 N. MacArthur Blvd, Suite 100
Irving, TX  75063
Direct:  972-406-4671
Fax:  972-484-2720

-----Original Message-----
From: LISTSERV site administrators' forum
[mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, March 11, 2010 1:09 PM
To: [log in to unmask]
Subject: Re: Invalid sender address

Russell Leighton <[log in to unmask]> wrote on 03/11/2010
12:54:19 
PM:


> I am getting this error for just this user on one of my lists.  When
he
> tries to manually login to my listserv site he gets this error:
> "SonicWALL - Blocked by Application Firewall".  I think his firewall
is
> blocking my listserv emails because he is the only account on that
list
> that gets an error message back to me. 

Someone's SonicWall firewall, possibly at the user's site, is blocking
the 
connection to your listserv server.  I would be that it is because the
URL 
contains ".EXE" and it thinks it may be a link to an executable malware 
and bblocks it.
 
> This is what I receive from my listserv.
> 
> Your message did not reach some or all of the intended recipients.
> 
>       Subject:         Re: Modified Early Warning System
>       Sent:               3/11/2010 10:16 AM
> 
> The following recipient(s) cannot be reached:
> 
>       [log in to unmask] on 3/11/2010 11:49 AM
>             There was a SMTP communication problem with the
recipient's
> email server.  Please contact your system administrator.
>             <mail.AARC.ORG #5.5.0 smtp;550 Invalid sender address
> (#5.7.1)>

Is this the same user??  The web access issue is probably separate from
an 
invalid address issue.  Can you send emails directly to this user?
 
> I am just trying to cover all my bases before I tell his IT department
> to look at their side.  Has anyone had this error that ended up being
> their fault.

Lots of luck on that one!




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