Not all attachments are coming through

I receive some but not all attachments to emails.  There are no error messages, just no attachments.  How do I fix this?

Hello,

I recommend checking if your antivirus/firewall filter ports that eM Client uses and also adding an exception for eM Client in your antivirus or firewall. If that doesn’t help, please check your server settings for a filter on attachments (for example it might not let attachments over certain size through.)