Exim: match recipient address against certain regex and conditional email delivery

Question

I need to allow my customers to use e-mails in format of 4ca2bc00-6789-4161-bae7-c11c5b91454e@example.com, where the username part is sort of UUID. Those emails should be delivered to certain (single) e-mail address (for example - inbound@example.com) to be processed later on, and the recipient address is used to distinguish among users. Generally, it's not possible to write those UUIDs into the /etc/mail/aliases because there's no way to know the list of those UUIDs in advance.

How can I configure routers for system aliases or local users to accept those e-mail addresses?

Kondybas · Accepted Answer · 2016-01-10T18:01:57.573

1

begin routers
guids:
  driver    = redirect
  senders   = \N^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}@example\.com$\N
  data      = inbound@example.com
  pipe_transport  = address_pipe
. . . . . .

That router catch all messages with localpart matched by regexp and redirect them to the single address.

edited Jan 10 '16 at 18:01

answered Jan 10 '16 at 16:52

Kondybas

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This answer could be improved with some explanation of what it does. – kasperd Jan 10 '16 at 17:19

score 0 · Answer 2 · answered Jan 10 '16 at 18:54

0

Just for the record

begin routers
....
regexalias:
  driver = redirect
  data = ${lookup{$local_part}wildlsearch{/etc/aliases.wildcard}}

/etc/aliases.wildcard

^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}        user

that allows to have more flexible patterns that do not require exim restart

answered Jan 10 '16 at 18:54

jdevelop

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And what if `$localpart` is not matched by regexps in the file? Huh? – Kondybas Jan 11 '16 at 02:30
then the email is rejected. Exactly what I need. – jdevelop Jan 11 '16 at 02:47
So you want that router be placed just before rejector? And all legal addresses are processed above? – Kondybas Jan 11 '16 at 02:49
then it will be caught by a next router. – jdevelop Jan 11 '16 at 02:52
Nope. After that router any not matched message become the message with no recipients – Kondybas Jan 11 '16 at 02:54
I would agree if that wouldn't work for me. But it does resolve the regular aliases through the system aliases route that appears after this route. – jdevelop Jan 11 '16 at 16:27

Exim: match recipient address against certain regex and conditional email delivery

2 Answers2