Furthermore if people uses multiple SMTP servers to send messages
out then you will loose the bounces to messages they sent via others
SMTP servers not using VERP.
This could be overcome with each SMTP server accessing a shared
database of VERP entries.
No. As an example when I use my mobile phone I have to use a specific
SMTP server of my mobile operator. I can anyway specify my real email
address and that domain is managed by my JAMES server..
If I used VERP in my james I would not receive bounces to messages
sent by my mobile phone.
Thank you. That example strikes the death-knell for VERP for me!
Unfortunately in SMTP there is no rule that the outgoing SMTP server
have to be the same of the MX server for the sender domain.
Which is precisely the problem with SPF. In SPF, you must list all
possible SMTP servers for your domain. This gets tricky when you are
using a third party to manage your address lists and they change the
IP address of their SMTP servers without telling you!
With SPF I can tell the world that my mobile operator is a valid
sender instead I cannot ask my mobile operator to use VERP shared with
my JAMES server ;-)
Point taken ;-) Although to be fair, I think you will find it very hard
to get an exhaustive accurate list of potential SMTP servers that might
be used to forward your email from. I believe SFP allows you to specify
sending domains with regular expressions. So you could say any IP
address from the *.mymobilephonecompany.com. However, that does incur a
lot more network activity from your mail server as it checks the IP address.
I'm not saying that SPF is better than VERP. None of them will save us
from spam. I just wanted to point out some VERP issue so our reader
will be less surprised later.
Thanks again. I've learned a lot too!
David Legg
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