Tras actualizar a FP8 los anexos PDF se envían corruptos. De forma provisional se soluciona desactivando el Disclaimer.  Saludos,

https://www.vlaad.lv/lotus.nsf/

IBM Support has confirmed issue under SPR #TPONAKFJLP / APAR  #LO91828. 
901FP8 IF1 will be released shortly. 
In description we received from IBM seems this is because of disclaimer, but in our case we have no disclaimer. 

info from IBM Support. ===== 
After Upgrade To Fp8, With Disclaimers Enabled, Pdf Attachments Have Content-transfer-encoding Of Binary And Can't Be Opened

After upgrade to FP8, with disclaimers enabled, PDF attachments have  Content-Transfer-Encoding of binary and can't be opened.
If the mail is sent without disclaimers added, the Content-Transfer-Encoding is Base64 and the attachment can be opened.