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[Bug]: SMTP relay fails to connect to Prontonmail bridge #1827

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opened 2026-04-24 23:59:16 +02:00 by adam · 10 comments
adam commented 2026-04-24 23:59:16 +02:00
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Originally created by @mpclepto on GitHub (Mar 18, 2024).

Describe the issue

While using the Proton mail bridge, ABS is unable to send emails via SMTP.

Steps to reproduce the issue

  1. Install / configure protonmail bridge app on unraid
    (configuration is known good as other apps (Ombi / overseer) function with the bridge)
  2. install / configure ABS to point to the mail bridge (whether "secure" or "insecure" is selected, neither function)
    (mail bridge config is known good as other services can send mail through it such as Ombi or Overseerr)
  3. receive the following log error while "secure" is selected in ABS:

[2024-03-18 15:19:39.116] INFO: [EmailManager] Sending test email
[2024-03-18 15:19:39.160] ERROR: [EmailManager] Failed to verify SMTP connection config [Error: B8ECF7BE60140000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354:
] {
library: 'SSL routines',
reason: 'wrong version number',
code: 'ESOCKET',
command: 'CONN'
} (EmailManager.js:17)

  1. receive the following log error while "insecure" is selected in ABS:

[2024-03-18 15:24:01.008] INFO: [EmailManager] Sending test email
[2024-03-18 15:24:01.059] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate
at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34)
at TLSSocket.emit (node:events:518:28)
at TLSSocket._finishInit (node:_tls_wrap:1085:8)
at ssl.onhandshakedone (node:_tls_wrap:871:12) {
code: 'ESOCKET',
command: 'CONN'
} (EmailManager.js:17)

With ABS, I am able to send emails to the Gmail SMTP gateway with no issues. I'm not entirely certain what the correct fix is here, but seeing as how this is entirely internal to my own network, I would be happy with a "allow self-signed cert" if that fixes the issue. Thanks in advance!

Audiobookshelf version

v2.8.1

How are you running audiobookshelf?

Docker

Originally created by @mpclepto on GitHub (Mar 18, 2024). ### Describe the issue While using the Proton mail bridge, ABS is unable to send emails via SMTP. ### Steps to reproduce the issue 1. Install / configure protonmail bridge app on unraid (configuration is known good as other apps (Ombi / overseer) function with the bridge) 2. install / configure ABS to point to the mail bridge (whether "secure" or "insecure" is selected, neither function) (mail bridge config is known good as other services can send mail through it such as Ombi or Overseerr) 3. receive the following log error while "secure" is selected in ABS: [2024-03-18 15:19:39.116] INFO: [EmailManager] Sending test email [2024-03-18 15:19:39.160] ERROR: [EmailManager] Failed to verify SMTP connection config [Error: B8ECF7BE60140000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354: ] { library: 'SSL routines', reason: 'wrong version number', code: 'ESOCKET', command: 'CONN' } (EmailManager.js:17) 3. receive the following log error while "insecure" is selected in ABS: [2024-03-18 15:24:01.008] INFO: [EmailManager] Sending test email [2024-03-18 15:24:01.059] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34) at TLSSocket.emit (node:events:518:28) at TLSSocket._finishInit (node:_tls_wrap:1085:8) at ssl.onhandshakedone (node:_tls_wrap:871:12) { code: 'ESOCKET', command: 'CONN' } (EmailManager.js:17) With ABS, I am able to send emails to the Gmail SMTP gateway with no issues. I'm not entirely certain what the correct fix is here, but seeing as how this is entirely internal to my own network, I would be happy with a "allow self-signed cert" if that fixes the issue. Thanks in advance! ### Audiobookshelf version v2.8.1 ### How are you running audiobookshelf? Docker
adam added the bug label 2026-04-24 23:59:16 +02:00
adam closed this issue 2026-04-24 23:59:16 +02:00
adam commented 2026-04-24 23:59:16 +02:00
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@advplyr commented on GitHub (Apr 26, 2024):

Are you still having this issue? What port are you using?

@advplyr commented on GitHub (Apr 26, 2024): Are you still having this issue? What port are you using?
adam commented 2026-04-24 23:59:17 +02:00
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@mpclepto commented on GitHub (Apr 29, 2024):

Yes this is still an issue and it is using port 25 for the protonmail bridge.

@mpclepto commented on GitHub (Apr 29, 2024): Yes this is still an issue and it is using port 25 for the protonmail bridge.
adam commented 2026-04-24 23:59:17 +02:00
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@advplyr commented on GitHub (Apr 30, 2024):

Have you tested with leaving secure toggled off? I read that the package we are using doesn't want that set for other ports which I updated for the next release but you can test now.

@advplyr commented on GitHub (Apr 30, 2024): Have you tested with leaving secure toggled off? I read that the package we are using doesn't want that set for other ports which I updated for the next release but you can test now.
adam commented 2026-04-24 23:59:18 +02:00
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@mpclepto commented on GitHub (Apr 30, 2024):

I have tested with secure off and it still has the same failure.

@mpclepto commented on GitHub (Apr 30, 2024): I have tested with secure off and it still has the same failure.
adam commented 2026-04-24 23:59:18 +02:00
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@0xGingi commented on GitHub (May 7, 2024):

I'm using ProtonMail SMTP Tokens rather than the bridge, but with secure on it doesn't work for me neither.

Turning secure off fixed it for me

With Secure On:
[EmailManager] Failed to verify SMTP connection config Error: C8912DC2777F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354:

@0xGingi commented on GitHub (May 7, 2024): I'm using ProtonMail SMTP Tokens rather than the bridge, but with secure on it doesn't work for me neither. Turning secure off fixed it for me With Secure On: [EmailManager] Failed to verify SMTP connection config Error: C8912DC2777F0000:error:0A00010B:SSL routines:ssl3_get_record:wrong version number:../deps/openssl/openssl/ssl/record/ssl3_record.c:354:
adam commented 2026-04-24 23:59:19 +02:00
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@advplyr commented on GitHub (May 7, 2024):

Thanks for confirming. I have this fixed for the next release

@advplyr commented on GitHub (May 7, 2024): Thanks for confirming. I have this fixed for the next release
adam commented 2026-04-24 23:59:20 +02:00
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@advplyr commented on GitHub (May 27, 2024):

Fixed in v2.10.0

@advplyr commented on GitHub (May 27, 2024): Fixed in [v2.10.0](https://github.com/advplyr/audiobookshelf/releases/tag/v2.10.0)
adam commented 2026-04-24 23:59:20 +02:00
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@jecpr commented on GitHub (May 29, 2024):

I am still having this issue after the fix.
Current version 10.0.1. Running proton mail bridge and have verified i can connect and authenticate. Proton serves smtp on port 1025. I have tried with both secure selected and not.
Log output when secure not selected:

[2024-05-29 20:27:05.018] INFO: [EmailManager] Sending test email
[2024-05-29 20:27:05.024] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate
    at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34)
    at TLSSocket.emit (node:events:519:28)
    at TLSSocket._finishInit (node:_tls_wrap:1085:8)
    at ssl.onhandshakedone (node:_tls_wrap:871:12) {
  code: 'ESOCKET',
  command: 'CONN'
} (EmailManager.js:17)

and with secure:

[2024-05-29 20:27:51.521] INFO: [EmailManager] Sending test email
[2024-05-29 20:27:51.527] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate
    at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34)
    at TLSSocket.emit (node:events:519:28)
    at TLSSocket._finishInit (node:_tls_wrap:1085:8)
    at ssl.onhandshakedone (node:_tls_wrap:871:12) {
  code: 'ESOCKET',
  command: 'CONN'
} (EmailManager.js:17)

Is there a way to tell it to not validate the ssl cert for the email?

Many thanks in advance!

@jecpr commented on GitHub (May 29, 2024): I am still having this issue after the fix. Current version 10.0.1. Running proton mail bridge and have verified i can connect and authenticate. Proton serves smtp on port 1025. I have tried with both secure selected and not. Log output when secure not selected: ``` [2024-05-29 20:27:05.018] INFO: [EmailManager] Sending test email [2024-05-29 20:27:05.024] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34) at TLSSocket.emit (node:events:519:28) at TLSSocket._finishInit (node:_tls_wrap:1085:8) at ssl.onhandshakedone (node:_tls_wrap:871:12) { code: 'ESOCKET', command: 'CONN' } (EmailManager.js:17) ``` and with secure: ``` [2024-05-29 20:27:51.521] INFO: [EmailManager] Sending test email [2024-05-29 20:27:51.527] ERROR: [EmailManager] Failed to verify SMTP connection config Error: self-signed certificate at TLSSocket.onConnectSecure (node:_tls_wrap:1674:34) at TLSSocket.emit (node:events:519:28) at TLSSocket._finishInit (node:_tls_wrap:1085:8) at ssl.onhandshakedone (node:_tls_wrap:871:12) { code: 'ESOCKET', command: 'CONN' } (EmailManager.js:17) ``` Is there a way to tell it to not validate the ssl cert for the email? Many thanks in advance!
adam commented 2026-04-24 23:59:20 +02:00
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@0xGingi commented on GitHub (May 29, 2024):

@advplyr I may be wrong, but since audiobookshelf uses nodemailer, there could easily be either a existing check on the SMTP cert or an additional toggle to add "rejectUnauthorized: false" in the createTransport to allow self-signed certs

@0xGingi commented on GitHub (May 29, 2024): @advplyr I may be wrong, but since audiobookshelf uses nodemailer, there could easily be either a existing check on the SMTP cert or an additional toggle to add "rejectUnauthorized: false" in the createTransport to allow self-signed certs
adam commented 2026-04-24 23:59:20 +02:00
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@jecpr commented on GitHub (May 29, 2024):

Yep, so I think a reasonable fix might be to include the following in the getTransportObject within /server/objects/settings/EmailSettings.js:

payload.tls = {
    rejectUnauthorized: false
  }
@jecpr commented on GitHub (May 29, 2024): Yep, so I think a reasonable fix might be to include the following in the getTransportObject within /server/objects/settings/EmailSettings.js: ``` payload.tls = { rejectUnauthorized: false } ```
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Reference: starred/audiobookshelf#1827
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