[PLUG] Sendmail is unable to send emails to users in same domain

[Vishal Rao]

So either you need smtp server port listening enabled on host abc.com or
there is a firewall rule blocking it, I guess.

On Wed, 23 Dec 2020, 14:21 Amey Abhyankar, <sco1984 at gmail.com> wrote:

> On Wed, 23 Dec 2020 at 12:50, Vishal Rao <vishalrao at gmail.com> wrote:
> >
> > Do you have mail server port open on abc.com itself and not some
> subdomain like smtp.abc.com?
>
> If I try to telnet on port 25 to abc.com, I get a connection refused
> message.[over private/internal IP range]
>
> >
> > On Wed, 23 Dec 2020, 12:33 Amey Abhyankar, <sco1984 at gmail.com> wrote:
> >>
> >> Hello,
> >>
> >> I am trying to configure sendmail on gitlab 13.x CE [on-prem
> >> server/CentOS 7] to send emails to the LDAP based gitlab users.
> >> [on-prem/traditional set-up]
> >>
> >> Sendmail is able to send email to any domains except its own domain.
> >>
> >> In logs, I am getting a message saying that the connection is refused
> >> by domain abc.com & the private IP of Windows based DNS server.
> >> The mailing solution for abc.com is taken from Google.
> >> We checked for any email in the queue from gitlab at gitlab.abc.com but
> >> no email in blacklist or spam section.
> >>
> >> mail sender is gitlab at gitlab.abc.com
> >> Reply to is noreply at gitlab.abc.com
> >>
> >> I tried to add abc.com domain in access file as = Connect:abc.com
> RELAY
> >> Tried with more R&D but same issue.
> >> Not helping.
> >>
> >> Any ideas how to fix the issue.
> >> I did a lot of Google.
> >> Those solutions did not work.
> >>
> >> Regards,
> >> Amey.
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> >
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