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John,
SMTP delivers e-mail based on the domain in the destination e-mail
address. So if your e-mail address is jdoe@xxxxxxxxxxx, it takes the
part after the @ symbol (example.com) and does a DNS lookup on it.
First, it looks for MX records for example.com. If no MX records exist,
it looks for the A record for example.com.
It sorts the MX records by priority, and then goes down the list until
one of them responds. Then, delivers the message to that server. If no
MX records, it contacts the host identified by the A record directly.
In both cases, if nothing responds, it puts it in a queue and tries
again later.
That's the normal way SMTP works. But sometimes, folks want all of
their e-mail to go through a particular mail server. This might be
because that mail server is the only one authorized to send mail through
their firewall. Or it might be that the IP address assigned to their i
is "dynamic", and therefore other SMTP servers might not accept mail
from them (due to spam blocking.) In cases like these (which, in my
experience, are the majority of IBM i shops) you configure the
FIREWALL/MAILROUTER parameters to forward the e-mail to a specific
server. (Or, on new releases, consider FWDHUBSVR instead.)
However, I don't understand this tangent to the conversation, since
these parameters apply equally to SNDDST and QtmmSendMail! Both go
through the same SMTP server.
One big diff between SNDDST and QtmmSendMail is that with QtmmSendMail,
you code the e-mail headers yourself. With SNDDST, the system supplies
them for you. Not exactly sure how this might relate to the issue, but
it's really all I can come up with at this point.
On 12/23/2010 8:13 AM, John Allen wrote:
Thanks for the info.
Looking at CHGSMTPA attributes it shows MAILROUTER= *NONE, given this, how
does it resolve to the email server to use?
Thanks
John
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