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Email Security Change Notice

This important alert has been posted on our website, referenced in all e-billing invoices, and printed in all monthly newsletters since November 2008.

Email viruses and security breaches will often hijack a subscriber’s computer and use it to distribute hordes of spam, acting like a mail server to communicate directly with other Internet service providers and bypass security policies.

When this happens the subscriber’s computer will slow dramatically under the load. But far worse, the many other ISPs who see these blasts of spam will identify the sender’s IP address, locate its host ISP, and start blocking all email from that ISP – including all of its subscribers! This takes time to straighten out, during which support desks handle many calls about bounced email.

A growing solution is to reconfigure mail servers to accept subscriber email only through a dedicated method, which also prevents subscriber computers from being used to communicate directly with any mail servers other than those of their own ISP. This dramatically reduces or eliminates the susceptibility to hijacking via this form of virus.

Therefore, at OCS we’ve reconfigured our mail servers to accept outgoing email on Port 587, which along with SMTP Authentication will put a stop to email hijacking. Our subscribers will need to make this same change in their own email programs, and after that transition is completed we’ll set our servers to stop accepting outgoing email on Port 25, the traditional SMTP default.

We will end the transition period in March 2009, and will then assist any callers who still need help making the change. Those who have not made the change will be unable to send email until they do so.

PLEASE SELECT YOUR EMAIL PROGRAM FROM THE LIST BELOW FOR CHANGE INSTRUCTIONS, or contact our office if you need further assistance!


  • Eudora
  • Outlook Express/Outlook 2000
  • Outlook 2002/2003
  • Outlook 2007
  • Windows Mail
  • Thunderbird
  • Apple Mail: Mac OSX 10.4.X
  • Apple Mail: Mac OSX 10.5.X
  • Networks/Servers

    OCS Email Port Change Instructions

    OCS Email Port Change Instructions

    Eudora

    1. Open Eudora
    2. Click on the "Tools" menu at the top
    3. Click on "Options"
    4. Click on "Sending Mail" to the left
    5. Check the box for "Allow authentication"
    6. Check the box for "Use submission port 587"
      Note: In some versions of Eudora Step 6 may not exist. Try looking in your Program Files > Qualcomm > Eudora > ExtraStuff folder. If there's a file named "esoteric.epi", copy it to the next level up (Eudora) and close and restart Eudora. Repeat Steps 2-5 above, then scroll down to the "Ports" option at the bottom and enter 587 for SMTP.

    Outlook Express/Outlook 2000

    1. Open Outlook
    2. Click on the "Tools" menu at the top
    3. Click on "Accounts" (or "Services" then Accounts)
    4. Click on the "Mail tab"
    5. Highlight your email account
    6. Click on "Properties" to the right
    7. Click on the "Servers" tab
    8. Check the box for "Outgoing server requires authentication"
    9. Click on "More settings" and check Same settings as incoming
    10. Click on the "Advanced" tab
    11. Change the outgoing port number from 25 to 587

    Outlook 2002/2003

    1. Open Outlook
    2. Click on the "Tools" menu at the top
    3. Click on "Email Accounts"
    4. Click on the "View or change existing e-mail accounts"
    5. Click "Next"
    6. Highlight your email account
    7. Click "Change..."
    8. Click on "More settings"
    9. Click on the "Servers" tab
    10. Check the box for "Outgoing server requires authentication" (same settings as incoming)
    11. Click on the "Advanced" tab
    12. Change the outgoing port number from 25 to 587

    Outlook 2007

    1. Open Outlook
    2. Click on the "Tools" menu at the top
    3. Click on "Account Settings"
    4. Click on the "E-mail tab"
    5. Highlight your email account
    6. Click "Change..."
    7. Click on "More settings"
    8. Click on the "Outgoing Server" tab
    9. Check the box for "Outgoing server requires authentication" (same settings as incoming)
    10. Click on the "Advanced" tab
    11. Change the outgoing port number from 25 to 587

    Windows Mail

    1. Open Windows Mail
    2. Click on the "Tools" menu at the top
    3. Click on "Accounts"
    4. Highlight your email account
    5. Click on "Properties" to the right
    6. Click on the "Servers" tab
    7. Check the box for "Outgoing server requires authentication"
    8. Click on "More settings" and check Same settings as incoming
    9. Click on the "Advanced tab"
    10. Change the outgoing port number from 25 to 587

    Thunderbird

    1. Open Thunderbird
    2. Click on the "Tools" menu at the top
    3. Click on "Account Settings"
    4. Click on "Outgoing Server SMTP"
    5. Highlight "smtp.ocsnet.net"
    6. Click "Edit"
    7. Change the port number from 25 to 587
    8. Check the box for "Use name and password" and enter your email user name

    Mac OSX 10.4.X

    1. Open apple mail
    2. Click on Preferences under "mail" in upper left hand corner of screen
    3. Email = Your user name @ocsnet.net
    4. Full name = Your full name
    5. Incoming mail server = mail.ocsnet.net
    6. Username = Your user name @ocsnet.net
    7. Password = Your Password
    8. Click on arrows at end of "Outgoing Mail Server (SMTP)
    9. Select "Edit Server List"
    10. Enter "smtp.ocsnet.net" in Outgoing Mail Server box
    11. Enter "587" in server port window.
    12. Click on arrows at right of Authentication box and select "Password"
    13. Enter your user name and password
    14. Click on "OK"
    15. Close next window by clicking on red button in upper left of screen.
    16. Test system by sending a message to yourself

    Mac OSX 10.5.X

    1. Open apple mail
    2. Click on Preferences under "mail" in upper left hand corner of screen
    3. Email = Your user name @ocsnet.net
    4. Full name = Your full name
    5. Incoming mail server = mail.ocsnet.net
    6. Username = Your user name @ocsnet.net
    7. Password = Your Password
    8. Click on arrows at end of "Outgoing Mail Server (SMTP)
    9. Select "Edit Server List"
    10. Enter "smtp.ocsnet.net" in Outgoing Mail Server box
    11. Click on "Advanced" at center, right
    12. Click on "Use Custom Port: and enter 587
    13. Click on arrows at right of Authentication box and select "Password"
    14. Enter your user name and password
    15. Click on "OK"
    16. Close next window by clicking on red button in upper left of screen.
    17. Test system by sending a message to yourself

    Many thanks to Tom Kelley for these Macintosh instructions! Tom provides support at MacExclusively, email tekelley@mac.com or phone 559-359-7565.

    Networks/Servers

      This change needs to be made on any server or workstation configured to send email directly to smtp.ocsnet.net. Just follow the instructions above for the specific email client program you're using, or contact OCS for further assistance.