A search reveals Thunderbird does add your personal IP address to outgoing emails. I did however find a fix, if anyone is interested:
Open Mozilla Thunderbird
Go to Preferences -> Advanced -> General
Click on Config Editor
Type in ”smtp” and find the number of the SMTP server you want to adjust (usually it will say smtp1)
Right click on the table and create a new string
Name it mail.smtpserver.smtp*.hello_argument, where * is the number of the SMTP server settings that you’re changing. Usually 1
Setup your ⊗⊗⊗⊗ IP to whatever value you want (e.g. 123.25.1.10)
Important: By changing your real private IP to a ⊗⊗⊗⊗ IP your email will be more likely be marked as spam by anti-spam filters.
After you perform these steps the headers of emails you sent will contain the IP you have setup.
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