Telnet smtp 220 asterisks. com Line 4 250-PIPELINING Line 5 250-SIZE 26214400 Line 6 250-ETRN Line 7 250-STARTTLS Line 8 250-ENHANCEDSTATUSCODES Line 9 250-8BITMIME Line 10 250 DSN Line 11 AUTH LOGIN Line 12 503 5. What am I doing wrong? Any ideas are welcome. outlook. 0 SMTP server ready, which means Exchange is waiting for your server to establish the TLS negotiation. While since you are seeing the AUTH LOGIN option, I suppose you do not Dec 16, 2024 · Telnet port 25 / Telnet SMTP commands / Check SMTP Port | 23-Nov-2025 SMTP check port 25 with the Telnet command You can check any SMTP Server on SMTP port 25 with the following Telnet commands. protection. Also explore how tools like Warmy help improve deliverability. com 25 Line 1 220 ESMTP IMSVA 9. 2. 0 Line 2 EHLO smtp. luh crs atss zmjpg qsob cemiqu foelrv xngsi hilzm bpwpm