Date: Mon, 5 Oct 2009 23:34:45 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: freebsd-questions@FreeBSD.ORG, kline@thought.org Subject: Re: way to check an email without sending it?? Message-ID: <200910052134.n95LYj9N032560@lurza.secnetix.de> In-Reply-To: <20091005195036.GC44739@thought.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Gary Kline <kline@thought.org> wrote: > telnet couldn't connect for unknown reason but thabks for the tip. I usually just The mail server for a domain doesn't have to run on that domain. That's what MX records in DNS are good for. For example, day, the address is cathy@example.org. Then use this command to find the mail servers for that domain: $ host -t mx example.org Every mail server has a priority number. The lowest number indicates the highest priority, i.e. the server that should normally be tried first. You should be able to telnet to that server on the SMTP port. If the MX list is empty, then either there is no mail mail server for this domain at all, or the domain is it's own mail server, i.e. you can telnet directly to example.org on the SMTP port (provided that it has at least an A record with a normal IP address). By the way, in the good old days (i.e. before spam) you could verify mail addresses with the SMTP VRFY command. But unfortunately, the days of spam have changed many things. :-( Most mail servers don't support VRFY anymore in order to protect against the spammers' address harvesters. Whatever you do to verify the address, it will not be completely without a trace. As soon as you connect to the SMTP port, it might cause an entry in that server's logfile, even before entering any SMTP command. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "Whatever happened to the days when hacking started at the cerebral cortex, and not at the keyboard?" -- Sid on userfriendly.org by Illiad, 2007-06-20
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200910052134.n95LYj9N032560>