STARTTLS vs SSL vs TLS

SSL and TLS are cryptographic protocols that protect email transmissions by encrypting data exchanged between clients and servers, with TLS replacing the now-deprecated SSL despite the terms often being used interchangeably. Because SMTP is unsecured by default, STARTTLS can upgrade an existing plain connection to TLS encryption, but it is opportunistic and may fall back to unencrypted delivery if the server does not support encryption or an attacker interferes; stronger authentication and end-to-end encryption can provide additional protection. In contrast, implicit or forced TLS requires a secure connection from the outset and abandons transmission if one cannot be established. Port 587 is widely used for SMTP submission with STARTTLS, while port 465 is commonly used for implicit TLS, and IMAP and POP3 similarly have separate ports for explicit and implicit encryption. Organizations are encouraged to use TLS 1.2 or newer, as older SSL versions and TLS 1.0 and 1.1 have known weaknesses or have been deprecated.

No tracked trend matches for this post yet.

Use this post, company, and trend context to find content marketing opportunities, perform competitive analysis, or address product feature gaps via the Plushcap MCP server or the Plushcap API.