is there a tel. no. I can use

how many addresses can be entered for one email 

Hello Peter,

If you have a PRO licence of eM Client, please log into our Support portal at: with the credentials we sent you right after the purchase.
For the FREE licence users, we run this community forum where you can find help from other users.

To your question: eM Client has no limit on recipients number. The only limit might be set by your mail server provider so please check it with your mail provider’s support.