max message size server config option

[mforde84]

Hi guys,

We are running into a 10mb size limit on relay to gen_smtp. We'd like to test potentially any size of message up to say 20 or 50mb. I noticed there was an issue around this before:

#184

I've very greenfield with erlang, I'm curious if or how we can specify this configuration option within our gen_smtp server session block? Sorry I know it's probably a basic question, I figured someone might be able to point me in the right direction.

Martin

[mforde84]

I made a post in gotthardp/rabbitmq-email#47 as well.

If I understand correctly the DEFAULT_MAXSIZE option is not over-rideable namely because its not specified as an option()

https://github.com/gen-smtp/gen_smtp/blob/master/src/gen_smtp_server_session.erl#L93

If I were to MR this would that be something you'd willing to discuss or commit to build?

[lukebakken]

Note: this issue can be closed. It will be resolved by this PR - gotthardp/rabbitmq-email#54

[arjan]

note that handle_HELO and handle_EHLO can return a list of SMTP server options. This way it is possible to override the maxsize. Although admittedly it is not very straightforward.

Elixir example from real code base:

  @maxsize 1000 * 1024 * 1024

  @impl true
  def handle_HELO(hostname, state) do
    {:ok, @maxsize, %State{state | helo: hostname}}
  end

  @impl true
  def handle_EHLO(hostname, extensions, state) do
    extensions = [{'SIZE', '#{@maxsize}'} | :lists.keydelete('SIZE', 1, extensions)]
    {:ok, extensions, %State{state | helo: hostname}}
  end

[lukebakken]

@arjan thanks for pointing out handle_EHLO/3