Apparently I needed to enable debug logging. 

>From the log it seems that I need to use a fully qualified hostname. That, 
however,  has never been a problem before. This account is from -95 and 
I've been using K-9 for a few years as well). Since I can't do anything 
about the hostname does anybody have ideas about what might be going wrong? 
 
 
The log itself:
K9-Mail version: 5.008
Device make: samsung
Device model: SM-N910F
Android version: 5.1.1

com.fsck.k9.mail.MessagingException: Unable to send message
at 
com.fsck.k9.mail.transport.SmtpTransport.sendMessageTo(SmtpTransport.java:539)
at 
com.fsck.k9.mail.transport.SmtpTransport.sendMessage(SmtpTransport.java:495)
at 
com.fsck.k9.controller.MessagingController.sendPendingMessagesSynchronous(MessagingController.java:3563)
at 
com.fsck.k9.controller.MessagingController$20.run(MessagingController.java:3314)
at 
com.fsck.k9.controller.MessagingController.run(MessagingController.java:435)
at java.lang.Thread.run(Thread.java:818)
Caused by: 
com.fsck.k9.mail.transport.SmtpTransport$NegativeSmtpReplyException: 
Negative SMTP reply: 504 5.5.2 <android-8513f86d1377e753>: Helo command 
rejected: need fully-qualified hostname
at 
com.fsck.k9.mail.transport.SmtpTransport.checkLine(SmtpTransport.java:649)
at 
com.fsck.k9.mail.transport.SmtpTransport.executeSimpleCommand(SmtpTransport.java:690)
at 
com.fsck.k9.mail.transport.SmtpTransport.executeSimpleCommand(SmtpTransport.java:654)
at 
com.fsck.k9.mail.transport.SmtpTransport.sendMessageTo(SmtpTransport.java:524)
... 5 more  


On Monday, 21 March 2016 19:49:52 UTC+2, Philip Whitehouse wrote:
>
> Check the K9mail-errors folder for the account you are sending emails 
> from. 
>
> If it's not there then the only way to get it is by looking at the debug 
> logs. 
>
> - Philip 
>
> On 2016-03-21 17:47, [email protected] <javascript:> wrote: 
> > I just changed my outgoing SMTP password and now I cannot send email 
> > at all. I'm fairly certain I typed new password in correctly because 
> > when I deliberately mistype I get an error and can't save server 
> > settings 
> > 
> > When I try send email I get an SMTP error in my notifications but when 
> > I try to open it I only get the K-9 folder list. From the notification 
> > I can tell the error begins like this: 
> > Negative SMTP reply: 504 5.5.2 <android-8 ... 
> > 
> > The rest is hidden but propably might be useful. The server I use is a 
> > small private server, not google. 
> > 
> > My phone is Note 4 and I'm using android 5.1.1 Anybody know how I 
> > could see the error in it's entirety? 
> > 
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