Thank you very much Jonathan! As you mentioned, it's an issue with my provider, they are blocking the ports by default. Thanks again! -- Victor On Mon, Jan 20, 2020 at 6:24 PM Jonathan Billings <billings at negate.org> wrote: > On Mon, Jan 20, 2020 at 06:04:47PM -0300, V. M. Tame-Reyes wrote: > > I apologize in advance, for the following could be too simple, but I > can't > > figure it out. > > I configured a vps using centos 8, all is working fine but I'm not able > to > > send email from this server. > > I tried > > $ telnet smtp.mailtrap.io 25 but it doesn't work > > yet > > $ telnet www.google.ca 80 does work > > and particularly > > $ telnet smtp.mailtrap.io 2525 does work too. > > I temporarily disabled the firewall, and selinux, but no luck. > > Can anyone provide any pointers? > > Are you configuring your VPS running CentOS 8 to run an SMTP server on > port 25, or are you trying to make your VPS running CentOS 8 talk to > an external SMTP server? > > It sounds like you are trying to make your VPS talk to an external > SMTP server. By default, the firewall shouldn't prevent outbound > connections. However, some VPS providers, as well as residential > ISPs, do block outbound traffic to port 25, in an attempt to prevent > compromised systems from sending spam. I suggest you look at the > documentation for your VPS provider and see if you are permitted to > send SMTP mail from the host. You may need to relay mail through an > authenticated SMTP relay run by the VPS provider. > > -- > Jonathan Billings <billings at negate.org> > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos >