I checked with "2.0.2  German version WIN XP: [680m5(Build9011)]" and found out,
that the table formatting for a table in the heading of my documet looks wrong
after Meil Merge E-Mail.

Steps to reproduce:
1. Unpack my test kit to a folder 'C:\mailmergetest'
2. make 'testaddresses.odb' available for your OOo installation
3. Insert some useful existing  E-mail-addresses to column 'AG' in 'addresses.ods'
   and close 'addresses.ods'
4. Close and restart OOo
5. Open 'tabletest.odt'
6. Send Mail Merge e-mail using mail merge assistant
6.1. Menu 'Tools - Mail Merge Assistant - Current document' <continue>
6.2. Radio button 'E-Mail'  <continue>  <continue>  <continue>  <continue>
     <continue> (Until your  reach step 8.)
6.3. In step 8. of MMA select radio button 'send as E-Mail', select field
     "Email" for 'To', write some useful subject and select "send as 
     Adobe PDF document"  <send documents>
     documents will be sent
7. Now compare the heading in an e-mail attachment you have got with the 
   original heading ('tabletest.pdf' and 'tabletest_result.odt'): 
   Expected: headings look equal in both documents (odt / PDF)
   Actual:  in the new PDF the horizontal line between 
   "Bielefeld & Buß" and "Regelsysteme ...." has become a strike through
   for  "Bielefeld & Buß".

That ugly effect does not appear if you export the document with the normal PDF
export function.

I will test with 2.1 soon