On 10/15/2014 6:22 PM, Linda Walsh wrote:


Kevin A. McGrail wrote:
On 10/15/2014 5:06 PM, Linda Walsh wrote:
Kevin A. McGrail wrote:
On 10/8/2014 11:35 PM, Linda Walsh wrote:
But if it doesn't look enough like a valid email, for it to be processed by their SW, I could see it bouncing... but not anything under my control.
Not sure what to tell you, sorry. Appears to be an ISP issue to me. You might consider using something like a free gmail account instead thought that might be out of the frying pan and into the fire.
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    Actually they are doing the right thing.
A discussion more suited to the EZMLM mailing list as debating it here will not solve your issue because we are just using the software: http://cr.yp.to/lists.html#ezmlm
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    But it is also very pertinent here..

many people think that invalid return addresses are ok to accept
for delivery -- when the RFC's are pretty clear that they MUST
be rejected at the earliest point possible -- since without
a valid return address, no failure message can be sent --
and that is required.

Personally, I hate RFC debates especially when they clearly differ from active practice of significant portions of the internet and stop email from flowing.

Step 1 for me is email flow.
Step 2 is following RFCs as best I can.
Step 3 is encouraging software to follow RFCs better to improve things.

I always remember the Facsimile machine specs that were written AFTER the first working Fax machines and led to interoperability issues for quite a while.

However, back on the issue, the RFC section you quoted has a follow-up sentence which may discount the MUST:

   Despite the apparent
   scope of this requirement, there are circumstances in which the
   acceptability of the reverse-path may not be determined until one or
   more forward-paths (in RCPT commands) can be examined.

I hate RFCs.

Regards,
KAM

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