Fix virtuser_file plugin email2user() function not accounting for backward slashes in username #9668
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This addresses login issues when using aliases, if the resolved username includes a '@' character.
In the /etc/postfix/virtual file, usernames including a '@' character are saved with a leading '' character.
For example:
[email protected] becomes rocky.balboa**@**company.com
The function right above (user2email()) is accounting for this issue, it just seems it was forgotten for email2user().
I discovered this because I am using Roundcube with Webmin/Virtualmin.
Starting recent versions, Virtualmin includes the '@' character in internal usernames. In previous versions it was replaced by a '%' character, thus there was no need for a leading ''.