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Alberto Bertogli
f3374e7923
Today we use the HELO/EHLO domain in a variety of places, which are informational, but some have specific syntax (like the Received header). Using the un-sanitized values can lead to some confusing and/or invalid values. This is not very risky today, but it could be problematic in the future if these strings are used in other contexts. To prevent those problems, this patch sanitizes the HELO/EHLO domain when receiving it. Hooks used to receive the sanitized and raw variants; now, both are sanitized (the raw one is kept for backwards compatibility). If the sanitization leaves the string empty, we use the hard-coded no-valid-characters.invalid as a placeholder, to make this situation easier to identify when troubleshooting.