[Building Sakai] mail sending failures - greylisting

[David Horwitz]

Steve,

Might help if we knew something about the specifics of your mail setup. 
Do you forward the mail to an MTA on the same machine, or another  MTA 
(e.g. smtp.lacaster.ac.za)?
Do you see anything in the recieving MTA logs?

D

Matthew Buckett wrote:
> On Thu, Mar 12, 2009 at 10:59 AM, Steve Swinsburg
> <s.swinsburg at lancaster.ac.uk> wrote:
>   
>> Hi all,
>> I am getting the following errors when sending mail from within Sakai,
>> either via Site Info > Add Participants, or via the Mailtool:
>> Failed to send email.
>> Error message: Sending failed; nested exception is: class
>> javax.mail.SendFailedException: Invalid Addresses;
>> nested exception is: class javax.mail.SendFailedException: 451 4.7.1
>> Greylisting in action, please come back in 00:10:00
>> I've never seen this before. the email addresses I am supplying are valid
>> and varied (ie not all the same domain), but it returns this error so
>> quickly that I think it's something to do with the mail setup on this end,
>> not the receiving end.
>>
>> Anyone know what the go is here?
>>     
>
> Shot in the dark...
>
> We at one point had problems with outbound mails getting rejected
> because we weren't giving a valid SMTP HELO command, I didn't track
> down what was causing this but just forced javax.mail to use a good
> hostname.
>
> http://jira.sakaiproject.org/jira/browse/SAK-11775
>
> Now we run a SMTP server on localhost and sakai just delivers to
> localhost which then forwards all the mail to our institutional
> servers. This is much more robust generally (once setup).
>
>   
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