5 ms·

I'm surprised to hear that. I've never had a problem with an ISP blocking SMTP.

by doctorohhnoes 13y ago

kodablah 13y ago
Inbound on port 25? I know my ISP does
- doctorohhnoes 13y ago
  Come to think of it, I've never looked at inbound stuff. You'd think outbound would be where all the spam problems come from, though.
  - sliverstorm 13y ago
    If you block 25 outbound, people's mail clients (Outlook, Thunderbird, etc) could not deliver mail to servers that don't run SSL or TLS (465, 587)
    - werid 13y ago
      Lots of ISPs does this. They require you to relay via their SMTP-server.
    - daigoba66 13y ago
      Used to have Bellsouth DSL, and they did this. SMTP/TLS on a different port worked though. But obviously you couldn't run your own e-mail server.
    - ckuehl 13y ago
      Ideally you would use port 587, which is the designated port for mail submission. See RFC 2476 [1]. This requires that your mail provider supports that port, of course, which is unfortunately not always the case. [1] http://www.ietf.org/rfc/rfc2476.txt http://www.ietf.org/rfc/rfc2476.txt
  - pyre 13y ago
    > You'd think outbound would be where all the spam problems come from, though. They block port 25 to prevent open relays on their network (i.e. someone sends a forged email, the SMTP server does no authentication, and just forwards it on to the destination).
- __david__ 13y ago
  Mine doesn't (Roadrunner). I run my own SMTP server off my cable modem. I have no problems getting incoming mail. Outgoing, however, was a pain because so many SMTP servers block mail coming from dynamic IPs. It annoys me to no end. I understand the reasons for doing it, but it annoys me to no end. I had to set up a small satellite server on a static IP that I route all my outgoing mail through.
  - jdhendrickson 13y ago
    This leads me to wonder why you run any portion of your mail server from your home if you have access to a small satellite server?
    - teddyh 13y ago
      To search your home, a warrant is needed. To search a remote site, less is needed, and you might never know it’s been searched, back-doored and compromised.
    - __david__ 13y ago
      Mostly because the small satellite server requires very little storage, cpu, or memory. I have about 100G of mail on my IMAP server (not all in one account: I run email for everyone in my family), and that kind of space isn't cheap in the server rental business (despite the fact that a 2TB drive is $90). Plus I just like having my data here, and not somewhere where I have no physical access.

I'm surprised to hear that. I've never had a problem with an ISP blocking SMTP.

kodablah 13y ago

Inbound on port 25? I know my ISP does

doctorohhnoes 13y ago
Come to think of it, I've never looked at inbound stuff. You'd think outbound would be where all the spam problems come from, though.
- sliverstorm 13y ago
  If you block 25 outbound, people's mail clients (Outlook, Thunderbird, etc) could not deliver mail to servers that don't run SSL or TLS (465, 587)
  - werid 13y ago
    Lots of ISPs does this. They require you to relay via their SMTP-server.
  - daigoba66 13y ago
    Used to have Bellsouth DSL, and they did this. SMTP/TLS on a different port worked though. But obviously you couldn't run your own e-mail server.
  - ckuehl 13y ago
    Ideally you would use port 587, which is the designated port for mail submission. See RFC 2476 [1]. This requires that your mail provider supports that port, of course, which is unfortunately not always the case. [1] http://www.ietf.org/rfc/rfc2476.txt http://www.ietf.org/rfc/rfc2476.txt
- pyre 13y ago
  > You'd think outbound would be where all the spam problems come from, though. They block port 25 to prevent open relays on their network (i.e. someone sends a forged email, the SMTP server does no authentication, and just forwards it on to the destination).
__david__ 13y ago
Mine doesn't (Roadrunner). I run my own SMTP server off my cable modem. I have no problems getting incoming mail. Outgoing, however, was a pain because so many SMTP servers block mail coming from dynamic IPs. It annoys me to no end. I understand the reasons for doing it, but it annoys me to no end. I had to set up a small satellite server on a static IP that I route all my outgoing mail through.
- jdhendrickson 13y ago
  This leads me to wonder why you run any portion of your mail server from your home if you have access to a small satellite server?
  - teddyh 13y ago
    To search your home, a warrant is needed. To search a remote site, less is needed, and you might never know it’s been searched, back-doored and compromised.
  - __david__ 13y ago
    Mostly because the small satellite server requires very little storage, cpu, or memory. I have about 100G of mail on my IMAP server (not all in one account: I run email for everyone in my family), and that kind of space isn't cheap in the server rental business (despite the fact that a 2TB drive is $90). Plus I just like having my data here, and not somewhere where I have no physical access.