Has anyone built a component to queue email until an SMTP relay server is available?
Some of my applications send email reports and alerts, currently using the ICS SMTP component directly to a relay SMTP server. There are simple retry attempts if the SMTP server can not be contacted or if it refused the email due to greylisting, but no further email can be sent while retrying it occurring, so it's very limiting. Specifically, greylisting needs a retry after 10 or 15 minutes, and one can just not wait that long blocking other emails. So my applications need a mail queue, where email can be spooled as disk files and retried for up to 48 hours or something. If implemented as a threaded component, it could be linked into the applications accepting fully formatted emails with all headers through a function. Or it could be a standalone pick-up mail server than scans an incoming directory for mail files, like the old Microsoft SMTP server used to do with Windows NT. Or even implemented as a full SMTP relay server than listens on port 25, but then anti-spam stuff becomes important and potentially very complex. Has anyone found a simple solution to mail queuing, before I start writing something myself? It can not be a third party application, since I need to distribute it with my own applications. Angus -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
