Am Wed, 03 Mar 2010 13:26:26 +0100 schrieb Jeroen Massar:
Thomas Mueller wrote:
hi
customers phoned me that they could not send emails anymore. needed to switch to port 587.
Maybe there is something filtering between you and them. They should be using port 587 anyway which is supposed to be the submission port. Unless they are running a fullblown SMTP setup on a DSL link of course.
yeah, nothing against port 587, but blocking port 25 without informing customers BEFORE is not the way to go. (most) mail-clients use port 25 if you do not specify it manually.
maybe swisscom has reasons to do this - trojans/viruses sending spams maybe?
now heard from others that swisscom is blocking port 25 ??? what the heck is going on ?
Which "others" and what metrics do they have?
a colleague too got calls from customers not able to send mails anymore. take a look at this blog entry http://blog.neocid.li/?p=105