Hi I have Avast Internet Security on a Win 7 64bit pro PC. My ISP is AOL I have been using Thunderbird mail client for many Years. With AVAST From today I can receive but not send out mail through Thunderbird from My AOL address, (but can send using my gmail address) If I disable AVAST Internet Security then Mail comes back on line. I've checked to see that the AVAST Certificate is correctly identified in Thunderbird Cetificate manager - it appears to be OK. I get both Time-out error messages and "The mail server sent an incorrect greeting .... Connect Error 10060" Error Messages It appears to be that AVAST is suddenly blocking outgoing mail through AOL from Thunderbird Would appreciate any suggestions as to how to resolve this Thanks