Error sending SMTP email: DH key is too small

When I use my custom SMTP server which I use everywhere else without problems I’m getting this error when testing or trying to send an email:

The sending of the email fails with this error:


"date": "2020-05-29T19:50:59.493Z",

"type": "fn",

"description": "To: [](",

"connection_id": "",

"details": {

"email_type": "try_provider_configuration_email",

"to": "[](",

"error": "140491974952832:error:141A318A:SSL routines:tls_process_ske_dhe:dh key too small:../deps/openssl/openssl/ssl/statem/statem_clnt.c:2150:\n"


"log_id": "90020200529195104918000554811230642150671509518880342082",

"_id": "90020200529195104918000554811230642150671509518880342082",

"isMobile": false,

"user_agent": "Other 0.0.0 / Other 0.0.0"


Any idea how to fix this? I’ve reached out to my SMTP provider and they said they don’t think it’s on their end.


1 Like

same issue here. Did you find any solution?