| Port No | 25 |
| Service Name | SMTP / mail |
| RFC Doc | 2821 |
| Protocol | UDP |
| Description | Simple Mail Transfer Protocol This port is used to transfer mail to servers from clients or other servers. Since clear text communication is used, improperly configured servers allow email to be relayed, resulting in spam. |
| Reference Link | Simple Mail Transfer Protocol: RFC2821 |
| Attack | Anti Virus scanning of email is recommended. |
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