Exim4 + pdd.yandex.ru + several accounts - what could be the problem?

Question

Domain Name System

Good day to all!
There was such an interesting question with the support of two accounts for one smtp
. There is an account on pdd.yandex.ru, where two domains are added - domain1.ru and domain2.ru, as well as a server with exim4 configured as a relay.
Contents of update-exim4.conf.conf
dc_eximconfig_configtype='smarthost'
dc_other_hostnames='maildomain.ru'
dc_local_interfaces='127.0.0.1 ; #external_ip#; ::1'
dc_readhost='maildomain.ru'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets='#relay_ip#;'
dc_smarthost='smtp.yandex.ru:587'
CFILEMODE='644'
dc_use_split_config='true'
dc_hide_mailname='true'
dc_localdelivery='mail_spool'
Where #external_ip# and #relay_ip# are real values.
Contents of passwd.client
smtp.yandex.ru:[email protected]:very_long_password
when sending, Exim logs in with credentials from domain1.
Here you need to somehow add another account for smtp.yandex.ru so that Exim learns to distinguish between them.
Tell me, please, knowledgeable people, how to solve this issue.

Answer 1

Exim4 has a /etc/email-addresses file that allows you to map users to email addresses in the form:
user: [email protected]