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Mon, Jan 09, 2017 10:32 pm

Thunderbird and Proxy Server Settings

When attempting to check email after installing Mozilla Thunderbird on a Windows 10 system and configuring an email account in Thunderbird, instead of email being downloaded, Thunderbird would show "Connecting to pop3.example.com" and seemed to be indefinitely stuck at that point. When I opened Wireshark to observe the network traffic between the Windows 10 laptop and the email server, I didn't see any traffic whether Thunderbird was configured to use the Post Office Protocol version 3 (POP3) port 110 or the secure version of the protocol POP3S on port 995. I set the Wireshark filter to be tcp.port eq 110 || tcp.port eq 995. I didn't see any traffic between to/from the server when I changed the filter to look for traffic to/from the IP address of the server with ip.addr == xxx.xxx.xxx.xxx where xxx.xxx.xxx.xxx was the IP address of the server. After puzzling over the matter for awhile, it finally dawned on me that I had prevoiusly configured the Microsoft Edge browser to use a SOCKS proxy server via a Secure Shell (SSH) tunnel set up with PuTTY. I had disconnected the PuTTY connection to the SSH server, but hadn't changed the proxy server settings for the system so I realized the was likely the cause of the problem, though I hadn't expected Thunderbird to use the system proxy server setting by default.

[More Info]

[/network/email/clients/thunderbird] permanent link

Mon, Nov 03, 2014 9:12 pm

Adding another SMTP Server to Thunderbird

To add another SMTP server for outgoing email in Thunderbird 24.6.0 on a Microsoft Windows systems, take the following steps:
  1. Hit Alt-T to bring up the Tools menu.
  2. Select Account Settings.
  3. An Account Settings window will open showing you all of the email accounts you have set up. Scroll down to the bottom of the list of accounts where you will see Outgoing Server (SMTP), which you should select by clicking on it.
  4. You will then see an Add button that you can click on to add an additional SMTP server for outgoing email.
  5. Complete the fields for the SMTP server, including "Description", "Server Name" and "Port", which will likely be 25 or 587. If you need to authenticate with the server when sending email, select the appropriate authentication method and provide a user name, if needed.

    Add SMTP Server to Thunderbird

  6. Click on the OK button.
  7. If you wish any of the email accounts you have set up in Thunderbird to use that SMTP server, select an account you wish to have use that outgoing email server by right-clicking on it, e.g. jdoe@example.com, and picking Settings. For the "Outoging Server (SMTP)" value, which you will see with the email address selected, i.e., don't click on "Server Settings" or any other option below the address, select the new server and click on OK.

References:

  1. Multiple SMTP servers - Thunderbird
    mozilaZine

[/network/email/clients/thunderbird] permanent link

Sun, Jan 12, 2014 12:31 pm

Using an Email Alias in Thunderbird

When I register an email address for a website, I normally create a new email alias unique to that website or the company associated with the website. Unfortuately, many companies and websites sell their email lists to other companies, ususally labelled as their "partners" in their privacy policies, seeing that as a way to make additional revenue from their customers or website visitors. Even if a company states they won't do so, most reserve the right to change their privacy policy at any time and there is also the possibility that the company will go out of business at some point and all assets, including its mailing lists, will be sold to others.

I receive an inordinate amount of spam every day and waste a lot of time purging it from my inbox, so by creating an email alias, which I can easily do, since I manage the email server that processes my email, I can simply invalidate any alias when I notice I'm receiving a lot of spam with a particular alias I created in the "to" field. E.g., if I created an alias Acme_2014@example.com that points to Me@example.com and start receiving spam to Acme_2014@example.com, I know that the Acme Corporation sold my email address to a spammer or had a compromise of their server holding my account information.

Since Acme_2014 is not an email address that a spammer who employs name dictionaries to distribute spam might use, I can be sure that the source of the email is using the email address I gave to the Acme Corporation. If I used an address such as abe, bill, or zachary@example.com, I couldn't be certain, since some spammers try sending email to a domain using every name from a name dictionary. I also wouldn't use acme@example.com, since that is a word in an English language dictionary, so spammers using a dictionary for building email addresses might use it.

I can easily create aliases on my email server, but there are a number of online services that will allow you to create such aliases to thwart spammers. E.g., with such a service you might be able to create an alias acme_2014@spamblock1.com that points to me@example.com, if me@example.com is the email address you normally use.

If you wanted to communicate with Acme Corporation by email, you might need to use the alias you used in the "from" field of email you send to them. To do so in Thunderbird 24.2.0, right-click on your account, which should be located at the top of the left pane of the Thunderbird window. E.g., you may see me@example.com there. Select Settings, then put the alias in the Email Address field and, if needed, set the Your Name field appropriately, then click on OK. Once you have sent the email you needed to send to the Acme Corporation you can change the settings back to those you normally use.

[/network/email/clients/thunderbird] permanent link

Fri, Mar 22, 2013 10:15 pm

Missing IMAP Folders in Thunderbird

Thunderbird was not showing some folders listed for an email account on an an IMAP server. In order to get them to display on the PC on which I was running Thunderbird 17.0.4, within Thunderbird I clicked on File, then selected Subscribe. I then saw a folder list with "Select the folders to subscribe to" displayed above the folders on the IMAMP server for the account. I checked the boxes to the right of the ones that weren't displaying. For some folders that had subfolders, I had to click on the rightward pointing arrowhead to the left of the folder to display the subfolders and their checkboxes.

[/network/email/clients/thunderbird] permanent link

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