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---
title: Mail Delivery with POP3
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---
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If you want to use POP3(S), you have to add the ports 110 and/or 995 (TLS secured) and the environment variable `ENABLE_POP3` to your `docker-compose.yml` :
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```yaml
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mailserver:
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ports:
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- "25:25" # SMTP (explicit TLS => STARTTLS)
- "143:143" # IMAP4 (explicit TLS => STARTTLS)
- "465:465" # ESMTP (implicit TLS)
- "587:587" # ESMTP (explicit TLS => STARTTLS)
- "993:993" # IMAP4 (implicit TLS)
- "110:110" # POP3
- "995:995" # POP3 (with TLS)
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environment:
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- ENABLE_POP3=1
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```