What is the maximum size limit for an email message in SMTP?

The maximum size limit for an email message in SMTP (Simple Mail Transfer Protocol) is generally around 10 to 25 MB, depending on server settings. This limit is not strictly defined by the SMTP protocol itself but rather by the configurations established by individual email service providers and their servers.

Many providers set these limits to manage server load and prevent abuse, as larger messages can strain network resources and increase the likelihood of delivery issues. The 10 to 25 MB range is commonly observed, as it balances practical usability for users while still being manageable for server infrastructure.

While some servers may be configured to allow larger messages, such as up to 50 MB, this is less common and typically varies by provider. Therefore, understanding that server settings significantly influence the size limit is essential for effective email management.

In contrast, the options referring to 5 MB or 50 MB reflect either outdated or less common configurations, while stating there is no limit disregards the fact that most servers do impose size restrictions.