我无法Mail（或Pony就此而言）连接以通过 smtp 服务器发送电子邮件，其中包含我知道正确的凭据、端口号和地址参数。但是，当使用邮件客户端（thunderbird、ink...等）时，我可以正常连接。
这是我得到的堆栈跟踪：
ruby gmx_test.rb
/Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/protocol.rb:153:in `read_nonblock': end of file reached (EOFError)
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/protocol.rb:153:in `rbuf_fill'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/protocol.rb:134:in `readuntil'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/protocol.rb:144:in `readline'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/smtp.rb:937:in `recv_response'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/smtp.rb:554:in `block in do_start'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/smtp.rb:947:in `critical'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/smtp.rb:554:in `do_start'
from /Users/sy/.rvm/rubies/ruby-2.1.0/lib/ruby/2.1.0/net/smtp.rb:519:in `start'
from /Users/sy/.rvm/gems/ruby-2.1.0/gems/mail-2.5.4/lib/mail/network/delivery_methods/smtp.rb:112:in `deliver!'
from /Users/sy/.rvm/gems/ruby-2.1.0/gems/mail-2.5.4/lib/mail/message.rb:2129:in `do_delivery'
from /Users/sy/.rvm/gems/ruby-2.1.0/gems/mail-2.5.4/lib/mail/message.rb:234:in `deliver'
from /Users/sy/.rvm/gems/ruby-2.1.0/gems/mail-2.5.4/lib/mail/mail.rb:140:in `deliver'
from gmx_test.rb:29:in `<main>'
这是生成的代码：
require 'mail'
gmx_options = { :address => "mail.gmx.com",
:port => 465,
:user_name => '<username_redacted>@gmx.com',
:password => '<password_redacted>',
:authentication => 'plain',
:enable_starttls_auto => true }
Mail.defaults do
delivery_method :smtp, gmx_options
end
Mail.deliver do
to '<redacted>
from '<username_redacted>@gmx.com'
subject 'TEST'
body 'Hi.'
end
这是能够发送电子邮件的桌面电子邮件客户端之一的服务器设置的屏幕截图：
最终情节转折：如果我使用 gmail 的 smtp，则此代码有效。
感谢你们的任何见解！