[plug] cannot send mail to certain domains

[Matt Kemner]

Hi Jon

On Mon, 1 Feb 2010, quoth Jon L Miller:

> Feb  1 11:28:15 mmtlnx postfix/smtp[31353]: EA83736CEB:
> to=<maria_louisedking at yahoo.com>, relay=none, delay=7749, status=deferred
> (Host or domain name not found. Name service error for name=yahoo.com
> type=MX: Host not found, try again)

Your postfix is having trouble resolving these domains - check what 
nameserver is being defined in /var/spool/postfix/etc/resolv.conf (which 
is normally generated from /etc/resolv.conf upon postfix loading) and make 
sure that nameserver is working correctly.  If necessary, change that to 
another (eg your ISP's nameserver)

  - Matt