I've no idea how to fix these errors.
This is what my maillog looks like /var/log/maillog
Sep 12 20:19:54 2400-1A00-B040 postfix/postfix-script[1532]: starting the Postfix mail system
Sep 12 20:19:54 2400-1A00-B040 postfix/master[1542]: daemon started -- version 2.10.1, configuration /etc/postfix
Sep 12 20:28:31 localhost postfix/postfix-script[1530]: starting the Postfix mail system
Sep 12 20:28:31 localhost postfix/master[1533]: daemon started -- version 2.10.1, configuration /etc/postfix
Sep 12 20:43:06 localhost postfix/postfix-script[1523]: starting the Postfix mail system
Sep 12 20:43:06 localhost postfix/master[1527]: daemon started -- version 2.10.1, configuration /etc/postfix
Sep 12 21:11:43 localhost postfix/pickup[1529]: BCEE7C5550C: uid=1001 from=<stupid.person123@gmail.com>
Sep 12 21:11:43 localhost postfix/cleanup[2046]: BCEE7C5550C: message-id=<BpJhd93-xYu_z-AAAAAAAAAAAAAAAAPyixLVHT-stupid.person123@gmail.com>
Sep 12 21:11:43 localhost postfix/qmgr[1530]: BCEE7C5550C: from=<stupid.person123@gmail.com>, size=2197, nrcpt=1 (queue active)
Sep 12 21:11:46 localhost postfix/smtp[2048]: BCEE7C5550C: to=<stupid.person123@gmail.com>, relay=gmail-smtp-in.l.google.com[2404:6800:4003:c01::1b]:25, delay=2.7, delays=0.12/0.02/1.4/1.2, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2404:6800:4003:c01::1b] said: 550-5.7.1 [2400:1a00:b040:3e9a:2e09:e520:263e:e743] The IP you're using to send 550-5.7.1 mail is not authorized to send email directly to our servers. Please 550-5.7.1 use the SMTP relay at your service provider instead. Learn more at 550 5.7.1  https://support.google.com/mail/?p=NotAuthorizedError c187-20020a6335c4000000b00577559f768fsi5085075pga.879 - gsmtp (in reply to end of DATA command))
Sep 12 21:11:46 localhost postfix/cleanup[2046]: 70FDFC08815: message-id=<20230912152646.70FDFC08815@localhost.localdomain>
Sep 12 21:11:46 localhost postfix/qmgr[1530]: 70FDFC08815: from=<>, size=4885, nrcpt=1 (queue active)
Sep 12 21:11:46 localhost postfix/bounce[2049]: BCEE7C5550C: sender non-delivery notification: 70FDFC08815
Sep 12 21:11:46 localhost postfix/qmgr[1530]: BCEE7C5550C: removed
Sep 12 21:12:16 localhost postfix/smtp[2048]: connect to gmail-smtp-in.l.google.com[74.125.130.27]:25: Connection timed out
Sep 12 21:12:18 localhost postfix/smtp[2048]: 70FDFC08815: to=<stupid.person123@gmail.com>, relay=gmail-smtp-in.l.google.com[2404:6800:4003:c01::1b]:25, delay=32, delays=0.01/0.01/31/1.1, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[2404:6800:4003:c01::1b] said: 550-5.7.1 [2400:1a00:b040:3e9a:2e09:e520:263e:e743] The IP you're using to send 550-5.7.1 mail is not authorized to send email directly to our servers. Please 550-5.7.1 use the SMTP relay at your service provider instead. Learn more at 550 5.7.1  https://support.google.com/mail/?p=NotAuthorizedError lx17-20020a17090b4b1100b0026d4415b926si10598578pjb.83 - gsmtp (in reply to end of DATA command))
Sep 12 21:12:18 localhost postfix/qmgr[1530]: 70FDFC08815: removed
Sep 12 21:14:17 localhost postfix/pickup[1529]: B3C7FC5550C: uid=1001 from=<stupid.person123@gmail.com>
Sep 12 21:14:17 localhost postfix/cleanup[2067]: B3C7FC5550C: message-id=<BpJhd93-Nd_aZ-AAAAAAAAAAAAAAAAP3c4jsx9-stupid.person123@gmail.com>
Sep 12 21:14:17 localhost postfix/qmgr[1530]: B3C7FC5550C: from=<stupid.person123@gmail.com>, size=2194, nrcpt=1 (queue active)
Sep 12 21:14:48 localhost postfix/smtp[2069]: connect to hi.mail.cx[159.69.105.69]:25: Connection timed out
Sep 12 21:14:48 localhost postfix/smtp[2069]: B3C7FC5550C: to=<stupid.person1@nqmo.com>, relay=none, delay=31, delays=0.04/0.02/30/0, dsn=4.4.1, status=deferred (connect to hi.mail.cx[159.69.105.69]:25: Connection timed out)
How do I resolve this issue? I've selfhosted osticket in my server. And I really don't think it's possible to send email from selfhosted server easily. Is there a way guys?