Earlier this week I replaced my router and modem with Spectrum's latest equipment offering higher speeds and a back up battery. Sometimes the outgoing emails come back unsent with the same message as others I see have noted. Error occurred while sending and I am using the same outgoing - mail.twc.com, for the outgoing server. I found that if I try to resend 2 or 3 more times the email does finally get sent. And yes my incoming emails come through without an issue. Also, for 2-3 days after making the equipment switch, when Thunderbird would check for emails and there were none to download, I would receive a message to check settings and that it was unable to connect. However by day 3 and 4 after the new installation I no longer receive that extra pop-up message that only started occurring after the equipment change. Any thoughts? Or is it Spectrum? Terri