SMTP over SSL/TLS uses port 465.
Here are the other relevant SSL ports from /etc/services:
Code:imaps 993/tcp # IMAP over SSL imaps 993/udp # IMAP over SSL pop3s 995/tcp # POP-3 over SSL pop3s 995/udp # POP-3 over SSL urd 465/tcp smtps # URL Rendesvous Directory for SSM / SMTP over SSL (TLS)
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