On Thu, 24 Jan 2019, Rob Gunther via Exim-users wrote:
We are accepting mail for customer domains, then delivering the mail using
Exim to the customer server. Customer servers can be anywhere, as long as
it answers to SMTP requests.
Come across a problem, two users hosted by Google.
Customer 1 has somehow added IP restrictions in the Google platform to only
accept mail from specific IP addresses. He has messed up and not added one
of our IP addresses to the list, so google rejects the message deliveries
with:
421 4.7.0 IP not in whitelist for RCPT domain, closing connection.
We have Exim put the message back into the delivery queue for a retry later.
Do the retried messages ever succeed ?
If the problem is that Google is not accepting from *one* of your IP
addresses, I am surprised if the retries ever succeed for that customer.
If this is indeed the problem, it would be better to have an exim router
*on that host* that passes customer1's messages to another of your hosts,
which can then pass the message to google without problems.
(I am conflating "host" with sending IP address here).
--
Andrew C. Aitchison Cambridge, UK
[email protected]
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