I am considering moving over and using thunderbird as a desktop email client principaly to archieve my emails per the advice in the book. The book advices from a privacy and sercuity perspective that a email clinet such as thunderbrid should only be used to archive emails and not to send them. I dont think this is a big risk and I am considering using thinderbird to send emails as well, not just from a browser. Are you able to clarify and provide further insight on this ? What are the privacy and security risks of sending an email this way ? Please see extracts from book below. I do not recommend using them for daily access to these services, or to send email messages, but only as an archiving solution to make sure you always have a copy of your data offline. I use this only as an offline backup of all email in the event I cannot access my Proton Mail account online. I never send email from this application. A decade ago, my main concern about email privacy would have been exposure of a true IP address. Most of us still used email clients which shared the local IP address within the email headers of every sent message. he risk today is minimal. If you send an email from within a web browser through a service such as Proton Mail, Tuta, Fastmail, Gmail, etc., the recipient should only see the IP address of the email server. Your true home IP address should not be exposed. If you send an email from an email client while using these services, you are also usually protected. The emails bounce through the service provider's servers before going out and only includes those addresses. However, sending email through a client configured for corporate email may expose your true IP address. As an example, sending an email from your employer's provided address through a traditional emailclient from home could expose these sensitive details.