feat: add SMTP as alternative to Mailgun for email delivery - #7
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Operators can now set SMTP_HOST to use any SMTP server instead of Mailgun. SMTP_SSL=true selects implicit TLS (port 465); default uses STARTTLS (port 587). TLS versions are pinned to 1.2/1.3 with castore CA bundle. Both ssl_options and tls_options are set to cover implicit TLS and STARTTLS respectively.
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Operators can now set
SMTP_HOSTto use any SMTP server instead of Mailgun. TLS versions are pinned to 1.2/1.3 with castore CA bundle. Both ssl_options and tls_options are set to cover implicit TLS and STARTTLS respectively.