Can not send mail with postfix

Hi everyone, I’m trying to config sending email from application thought this tutorial.

But when I try to send an test email to my emails, its not work, I also try to sen one or another.

looking for log file its show

Oct 11 16:41:32 mail postfix/pickup[4727]: 81676819B8: uid=1000 from=<myuser@mydomain.com>
Oct 11 16:41:32 mail postfix/cleanup[5349]: 81676819B8: message-id=<20171011164132.81676819B8@mydomain.com >
Oct 11 16:41:32 mail postfix/qmgr[4728]: 81676819B8: from=<myuser@mydomain.com >, size=396, nrcpt=1 (queue active)
Oct 11 16:41:41 mail postfix/qmgr[4728]: 8CF22819B5: from=<myuser@mydomain.com >, size=396, nrcpt=1 (queue active)
Oct 11 16:42:02 mail postfix/smtp[5351]: connect to gmail-smtp-in.l.google.com[173.194.68.27]:25: Connection timed out
Oct 11 16:42:02 mail postfix/smtp[5351]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400d:c0c::1b]:25: Network is unreachable
Oct 11 16:42:02 mail postfix/smtp[5351]: connect to alt1.gmail-smtp-in.l.google.com[2800:3f0:4003:c01::1a]:25: Network is unreachable
Oct 11 16:42:11 mail postfix/smtp[5354]: connect to gmail-smtp-in.l.google.com[209.85.201.26]:25: Connection timed out
Oct 11 16:42:11 mail postfix/smtp[5354]: connect to gmail-smtp-in.l.google.com[2607:f8b0:400d:c03::1b]:25: Network is unreachable
Oct 11 16:42:11 mail postfix/smtp[5354]: connect to alt1.gmail-smtp-in.l.google.com[2800:3f0:4003:c01::1a]:25: Network is unreachable
Oct 11 16:42:32 mail postfix/smtp[5351]: connect to alt1.gmail-smtp-in.l.google.com[64.233.190.26]:25: Connection timed out
Oct 11 16:42:32 mail postfix/smtp[5351]: connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c03::1a]:25: Network is unreachable
Oct 11 16:42:32 mail postfix/smtp[5351]: 81676819B8: to=<myemail@gmail.com>, relay=none, delay=60, delays=0.01/0.01/60/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c03::1a]:25: Network is unreachable)
Oct 11 16:42:41 mail postfix/smtp[5354]: connect to alt1.gmail-smtp-in.l.google.com[64.233.190.26]:25: Connection timed out
Oct 11 16:42:41 mail postfix/smtp[5354]: connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c03::1a]:25: Network is unreachable
Oct 11 16:42:41 mail postfix/smtp[5354]: 8CF22819B5: to=<myemail@gmail.com>, relay=none, delay=1535, delays=1475/0.01/60/0, dsn=4.4.1, status=deferred (connect to alt2.gmail-smtp-in.l.google.com[2a00:1450:400b:c03::1a]:25: Network is unreachable)

I already using zoho mail service, could it be the reason.

Every thing I work on ubuntu 17.04

Thanks for any help.