If you’re using an SMTP other then Rogers own to send mail through you will have to change the port number. I send mail through my company mail server and just found out why I've been having problems the last 2 days. Rogers will no longer allow mail to be relayed through port 25 to SMTP's outside of Rogers network. My company has now set me up with an alternative SMTP port and all is ok. So if any of you have problems sending mail then maybe it's the block on port 25.
Rogers now blocks port 25
- Thread starter zzap
- Start date
Posted from a website I found...
What is Port 25?
Each and every Internet application, such as web, mail or ftp is assigned a unique port number by the Internet Assigned Names Authority (IANA). When a computer running mail server software starts up, it attaches to that port and uses it to listen for incoming requests. Because the port numbers are standardised across the Internet, clients can make reasonable assumptions about which port is the proper destination for a given service. When your computer needs to deliver an email to another person for example, it connects to a server on port 25 and sends the email to it. This server then sends it on to its destination. Because of the standard, you can always assume that port 25 is the SMTP mail server, not the HTTP (web) server which is port 80, or some other service.
So, why block on port 25?
Mail servers are probably the most complex piece of Internet software to configure correctly. By default these are "open" services and will happily send an email out to anywhere if one is sent to it. You can often be unaware that you are even running a mail server, therefore we block port 25 connections by default. This stops the spammers dead in their tracks from using your connection to send out spam.
What is Port 25?
Each and every Internet application, such as web, mail or ftp is assigned a unique port number by the Internet Assigned Names Authority (IANA). When a computer running mail server software starts up, it attaches to that port and uses it to listen for incoming requests. Because the port numbers are standardised across the Internet, clients can make reasonable assumptions about which port is the proper destination for a given service. When your computer needs to deliver an email to another person for example, it connects to a server on port 25 and sends the email to it. This server then sends it on to its destination. Because of the standard, you can always assume that port 25 is the SMTP mail server, not the HTTP (web) server which is port 80, or some other service.
So, why block on port 25?
Mail servers are probably the most complex piece of Internet software to configure correctly. By default these are "open" services and will happily send an email out to anywhere if one is sent to it. You can often be unaware that you are even running a mail server, therefore we block port 25 connections by default. This stops the spammers dead in their tracks from using your connection to send out spam.
Well, as the problem with email spamming trojans just gets worse and worse, more and more ISPs are blocking port 25
Of the 300 or so spam I get every day, over 95% are sent through spamming trojans (virus infected machines) that are their own smtp servers and send the spam directly out on port 25. If all ISPs were to start blocking port 25 from non-commercial dynamically assigned IP users, the spam traffic on the net would plummet and the world would be a LOT happier place.
Of the 300 or so spam I get every day, over 95% are sent through spamming trojans (virus infected machines) that are their own smtp servers and send the spam directly out on port 25. If all ISPs were to start blocking port 25 from non-commercial dynamically assigned IP users, the spam traffic on the net would plummet and the world would be a LOT happier place.
Spam email from a trojan does not need port 25!
They have a simple smtp server built in.
Port 25 is used for the email client to connect to the smtp server.
Email services such as yahoo and hotmail already check the sender ip, and if it is a rogers user ip, it is marked as spam. Only if it comes from Rogers smtp server is it not so marked.
Blocking port 25 is done by incompetents who do not understand spam.
Spammers are sophisticated, and they use non-standard ports, SSH and VPN tunneling to work their craft.
They have a simple smtp server built in.
Port 25 is used for the email client to connect to the smtp server.
Email services such as yahoo and hotmail already check the sender ip, and if it is a rogers user ip, it is marked as spam. Only if it comes from Rogers smtp server is it not so marked.
Blocking port 25 is done by incompetents who do not understand spam.
Spammers are sophisticated, and they use non-standard ports, SSH and VPN tunneling to work their craft.
