I wouldn't send a tiff by email - it will be large to begin with, and as an attachment it will increase in size with about 30%.
There's a chance that the recipient will not receive it because it might exceed the maximum attachment size for their email account.
So a much better solution is to put the file in a folder on Dropbox or similar, and share the folder with the recipient.
Or a use a service like Filemail.
Thank you very much for this information.
Is there a way to send a jpeg file which has at least 2.0 MB because usually we finding our pictures sending as ex. 103kb.
Per is right. What do you mean by "after I send it, the picture size is too small"? The size (and for that matter, quality) of a picture is not directly dependent on file size. A JPEG with the same pixel dimensions as it has in Lightroom exported at even 80% quality is plenty high quality. Sending as a TIFF will simply inflate the size of the file you're sending without making a perceptible increase in quality.
What are the pixel dimensions in Lightroom? Are you resizing the picture on export?
I do make it smaller and use the colors and send it
thank you Per and Hal
so thoughtful of you for global education as there is just so much in digital photo and even more from photo shop