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No support for RFC5321 4.5.2 Transparancy causing double periods #432

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AlexHaan-i opened this issue Jan 31, 2023 · 0 comments
Open

No support for RFC5321 4.5.2 Transparancy causing double periods #432

AlexHaan-i opened this issue Jan 31, 2023 · 0 comments

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@AlexHaan-i
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RFC5321 defines Transparancy in https://www.rfc-editor.org/rfc/rfc5321#section-4.5.2:

  • Before sending a line of mail text, the SMTP client checks the
    first character of the line. If it is a period, one additional
    period is inserted at the beginning of the line.

  • When a line of mail text is received by the SMTP server, it checks
    the line. If the line is composed of a single period, it is
    treated as the end of mail indicator. If the first character is a
    period and there are other characters on the line, the first
    character is deleted.

So, when a period character ends up at the start of a line in the e-mail source, the sending client will insert an extra period.
It's up to the SMTP server to remove that again.

So, if I have a url (either as normal text, or as attribute for an image or link) and one of its periods ends up at the start of a line, another period is added.
That extra period isn't stripped creating an invalid url.

Version I'm running should be the latest; Mailhog 1.0.1. But I'm not sure how I can verify that from my Docker container (which installs from here automatically and was built not more than a few months ago).

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