E-mail sending error?

My exchange is unable to send emails although I’ve configured SMTP information correctly. When I run logs, this is what I get:

{“level”:“verbose”,“message”:“1ca13533-6d79-4305-8ea9-4f64fe91f6b4 origin https://neonex.io”,“timestamp”:“2021-12-10T15:30:05.440Z”}
{“level”:“info”,“message”:“1ca13533-6d79-4305-8ea9-4f64fe91f6b4 controllers/user/requestResetPassword [email protected] email ip 27.7.162.231 domain https://neonex.io”,“timestamp”:“2021-12-10T15:30:05.441Z”}
[2021-12-10 15:30:05] DEBUG Creating transport: nodemailer (6.3.1; +https://nodemailer.com/; SMTP/6.3.1[client:6.3.1])
[2021-12-10 15:30:05] DEBUG Sending mail using SMTP/6.3.1[client:6.3.1]
{“message”:"::ffff:172.21.0.8 - - [10/Dec/2021:15:30:05 +0000] “GET /v2/reset-password?captcha=03AGdBq26hrqkQ2gxBS6JYKDsw-kzhBjV8FvFDweQ7O0tJQxGJ0divdabAbbf05t4Vl4X6E0WTUg7r-8xnChqYfljALKsLBOaTxN5wxzmDKCK56MWvOd4bwHuD4EeTUVKud5oBedB09QlBJC_wq3QgW3wY-1L67tSWp7x6U1seixWYP9pe5Rql6g234CLVVAh8ch32pOAyHXUTqD_E6-4_ablalRGl43hxoKrMTQvYtZfrnXYeMT8jNBcx10tSTNICjdnnV9ey7s4hPPT_VgugTOnUJymXFvPsF2YcA8G_mZFCYZTmJSb3Rmp7gDWrIuTPUEczmKcJ0UCQRZoyCqgl7Py6scPlaKq_mw-aMvHRWFWpjd_TKepKExnMepMcGuYPRh_85POLLcuASelOTAq6I-qHEZV9ib4ktvWc-tnvtamgMiAQalUdlCc&email=testuser%40gmail.com HTTP/1.0” 200 59 “https://neonex.io/” “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.93 Safari/537.36”\n ",“level”:“info”,“timestamp”:“2021-12-10T15:30:05.454Z”}
[2021-12-10 15:30:05] DEBUG [DN4qryafuU] Resolved us2.smtp.mailhostbox.com as 208.91.198.143 [cache hit]
[2021-12-10 15:30:05] INFO [DN4qryafuU] Connection established to 208.91.198.143:25
[2021-12-10 15:30:07] ERROR [DN4qryafuU] 140487987836736:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:…/deps/openssl/openssl/ssl/statem/statem_clnt.c:2157:
[2021-12-10 15:30:07] ERROR [DN4qryafuU]
[2021-12-10 15:30:07] DEBUG [DN4qryafuU] Closing connection to the server using “end”
[2021-12-10 15:30:07] ERROR Send Error: 140487987836736:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:…/deps/openssl/openssl/ssl/statem/statem_clnt.c:2157:
[2021-12-10 15:30:07] ERROR
{“code”:“ESOCKET”,“command”:“CONN”,“level”:“error”,“message”:“mail/index/sendSTMPEmail140487987836736:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:…/deps/openssl/openssl/ssl/statem/statem_clnt.c:2157:\n {“code”:“ESOCKET”,“command”:“CONN”}”,“stack”:“Error: 140487987836736:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:…/deps/openssl/openssl/ssl/statem/statem_clnt.c:2157:\n”,“timestamp”:“2021-12-10T15:30:07.073Z”}
[2021-12-10 15:30:07] INFO [DN4qryafuU] Connection closed
[2021-12-10 15:30:07] INFO [DN4qryafuU] Connection closed

Does anyone know what could be causing this issue and how to resolve it? I’ve been reading about decreasing OpenSSL security levels but I’m not sure…