Could this possibly be one of those moves to prevent hoax/phishing emails from being transmitted from home based mail servers?
Anyway, I have my email hosted in the US and can send/receive email without any issue. I recall receiving an email from Micronet about it quite a long while back about outbound email. Found it:
Dear Valued Customer,
During the past few months number of junk emails
received on our mail servers and through our
network has increased considerably. The root
cause of these junk/spam emails is largely some
valued customers PCs? are infected with viruses,
worms and Trojans etc. Any activity that is
generated from a user?s PC without Customer?s
permission/knowledge causes huge utilization/
loss of data volume/usage to both our
customer's(client's) and Micronet
These Spam/Junk email generation from customer's
LAN/PC leads to initiation of automated procedures/
polices configured on mail serves of blacklisting/
blocking of Spam/Junk email generating IP's, all
over the Internet world.
In order to safeguard our network and that of our
customers from being exploited by malicious
softwares, we will be blocking direct outgoing
mail (SMTP) access for customers who are not
running their own legitimate mail servers.
However, customers will be able to send emails
by using our mail server smtp.dsl.net.pk in their
email clients like Outlook/Eudora/etc).
Our mail server will scan all users emails for
viruses and spam content before they are sent
to their destination. Please note that this policy
is not applicable on usage of web based email
services, like Hotmail, Yahoo and Gmail etc.
We will implement email outgoing restriction
policy w.e.f 21st Oct, 2009.
If you have a corporate mail server that you use
for your outgoing emails, please get back to us
with complete server address and necessary details
in order to enable direct access through our
network.You are requested to provide the following
details for this purpose:
1: MBL User ID.
2: Mail Server ie. Sendmail, Ms-Exchange,Domino etc.
3: Mail Server IP.
4: No of Email users.
For further queries, please feel free to contact
us via email to email@example.com or by calling
111 11 44 44.
Technical Assistance Center
Micronet Broadband (Pvt.) Ltd.