Tag: pd-admin

Setting up Varnish caching server for pd-admin with Apache and php-fcgi

Deploying Varnish caching server can significantly speed up web-based applications, as well as simple websites. Varnish supports different back-end systems, ranging from the popular Apache web server to the more efficient nginx. Especially when it comes to handling high traffic sites Varnish can bring a considerable uplift to the responsiveness by e.g. caching entire pages […]

How to solve “550 sorry, user unknown” problem when using pd-admin

Recently, a client reported problems when trying to send mail to certain domains hosted on their own web server. The web server in question was running pd-admin as administration tool set. Mail hosting was done on a separate dedicated mail server. The error message reported by the client was theĀ infamous 550 sorry, user unknown Checking […]