[ruby-core:79065] [Ruby trunk Bug#13018] end of file reached (EOFError) from SMTP

Issue #13018 has been updated by Shugo Maeda.


Shugo Maeda wrote:
>  Can we close this issue by fixing backtrace information?

Closed by r57311, but feel free to reopen if you don't like it.


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Bug #13018: end of file reached (EOFError) from SMTP
https://bugs.ruby-lang.org/issues/13018#change-62477

* Author: Toby Murray
* Status: Closed
* Priority: Normal
* Assignee: Eric Wong
* Target version: 
* ruby -v: ruby 2.4.0preview3 (2016-11-07 trunk 56661) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Originally filed against Rails: https://github.com/rails/rails/issues/27298

```
require 'net/smtp'

real_email_address = '' # This needs to actually be a real account
real_email_password = '' # This needs to actually be the corresponding password

#line 96 of mail-2.2.7/lib/mail/network/delivery_methods/smtp.rb
smtp = Net::SMTP.new('smtp-relay.gmail.com', 587)
smtp.enable_starttls_auto if smtp.respond_to?(:enable_starttls_auto)
# smtp.set_debug_output $stderr # Uncomment this line to see SMTP session details

smtp.start('does-not-matter', real_email_address, real_email_password, 'Login') do |smtp|
  smtp.sendmail('Message does not matter', 'inconsistent from address', 'does not matter')
end
```

Yields `end of file reached (EOFError)`. From the discussion there, it seems like the SMTP relay is inappropriately killing the session, but I believe it should be wrapped in a different error - e.g. Net:SMTPError. As it stands, there's no stack trace available or this error, so it just appears and is difficult to find. 

Tried with 2.4.0-preview3, 2.3.3, and 2.3.1 (as well as jruby-9.1.6.0) and all had the same behavior



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