Is this a postfix problem? Receiving mail from cellphone

[Dave Johnson]

Dan Coutu writes:
> This is a RHEL server running postfix.
> 
> Sending email to the server from my cell phone is giving an error and I 
> don't understand why. I'm hoping that someone here can shed light on it 
> for me.
> 
> Here's the mail log entries that show the problem:
> 
> Dec  1 01:55:27 ec2-75-101-156-55 postfix/smtpd[31695]: connect from 
> 150.sub-69-78-129.myvzw.com[69.78.129.150]
> Dec  1 01:55:27 ec2-75-101-156-55 postfix/smtpd[31695]: NOQUEUE: reject: 
> RCPT from 150.sub-69-78-129.myvzw.com[69.78.129.150]: 450 4.7.1 
> <njbrspamp5.vtext.com>: Helo command rejected: Host not found; 
> from=<8023094781 at VTEXT.COM> to=<register at celltography.com> proto=ESMTP 
> helo=<njbrspamp5.vtext.com>
> Dec  1 01:55:32 ec2-75-101-156-55 postfix/smtpd[31695]: disconnect from 
> 150.sub-69-78-129.myvzw.com[69.78.129.150]
> 
> Thanks for any help or pointers to resolving this.

You phone (IP 69.78.129.150) is using a smtp client (or smtp relay)
that is identifying itself in the HELO SMTP message as
njbrspamp5.vtext.com which doesn't resolve using DNS.

njbrspamp5.vtext.com is likely a smtp relay which simply
doesn't have a public dns entry.

You can (carefully) loosen the HELO restrictions on your mail server
if you want to bypass this check for specific hosts.  Since the
postfix default is to allow everyting then you've likely already
modified this. See:

http://www.postfix.org/postconf.5.html#smtpd_helo_restrictions

-- 
Dave