temos que começar por editar o ficheiro /etc/exim4/exim4.conf.template e no final dos MAIN CONFIGURATION SETTINGS adicionar as seguintes linhas:
disable_ipv6 = true
dns_ipv4_lookup = *

o resultado será:

# always log tls_peerdn as we use TLS for outgoing connects by default
.ifndef MAIN_LOG_SELECTOR
MAIN_LOG_SELECTOR = +tls_peerdn
.endif

disable_ipv6 = true
dns_ipv4_lookup = *

#####################################################
### end main/01_exim4-config_listmacrosdefs
#####################################################

seguidamente executamos:
update-exim4.conf

e finalmente:
/etc/init.d/exim4 restart

https://www.digitalfoundations.com.au/blog/configure-exim-on-debian-whe…

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