Please use Google Translate to post in English. Questions translated: ''When I insert a link in an email, the link address is different.'' ''Hello. I am using Thunderbird Mail. When I insert a link in an email, the link address is different.'' ''I gave the link "cafe.naver.com/masterlesson" in "Link Test", but the result is "mail.naver.com/v2/read/0/cafe.naver.com/masterlesson".'' ''It is the same even if I use HTML.'' ''I sent the email from a Naver Mail account to a Naver Mail account.'' ''I added an additional attachment, so please check it and give me a quick reply''. In new Write message Insert > Link Enter Text to display for the link: '''masterlesson''' Link Location Enter a web page location....... '''https://cafe.naver.com/masterlesson''' DO NOT select checkbox 'Attach the source of this link to the message' click on 'OK' Save as draft. Then in Drafts folder, select saved draft email to read - click on link to check it works ok. It works ok for me.