Question Kunena 5.2.6 Email Notification Error

Hi,
Kunena forum email notification stopped working recently. the error is as follows2022-02-08 11:26:57.198 [51155] SMTP syntax error in "RCPT TO: [GGC Forum] <forum@>" H=() [127.0.0.1]:52596 I=[127.0.0.1]:25 missing or malformed local part (expected word or "<")
2022-02-08 11:26:57.198 [51155] H=() [127.0.0.1]:52596 I=[127.0.0.1]:25 incomplete transaction (connection lost) from <forum@>

Any help would be appreciated.

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Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
927	Forum	quick-access	view=home&defaultmenu=1308	forum-recent	No
160	Forum	mainmenu	view=home&defaultmenu=1308	ggc-forum	No
1306	Forum	kunenamenu	view=home&defaultmenu=1307	forum	No
1307	Index	kunenamenu	view=category&layout=list	forum/index	No
1308	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
1309	Unread	kunenamenu	view=topics&layout=unread	forum/unread	No
1310	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
1311	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
1312	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
1313	Profile	kunenamenu	view=user	forum/profile	No
1314	Help	kunenamenu	view=misc	forum/help	No
1315	Search	kunenamenu	view=search	forum/search	No

Joomla default template details : rt_vermilion | author: RocketTheme, LLC | version: 1.8 | creationdate: August 25, 2020

Kunena default template details : Crypsis | author: Kunena Team | version: 5.2.6 | creationdate: 2021-07-25

Kunena template params:

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DefaultCategoryicon	icon-folder
profileIconset	default
DefaultIconset	default
editorIconset	default
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Kunena version detailed: Kunena 5.2.6 | 2021-07-25 [ Melia ]
        | Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
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threads_per_page	20
messages_per_page	12
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attach_end	14
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| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Disabled
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=1  
 Kunena - Kunena Enabled:  avatar=1  profile=1  
 Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-AU	English (AU)
en-GB	English (United Kingdom)

Third-party components: None

Third-party SEF components: None

Plugins: Search - Kunena Search 5.2.2

Modules: Kunena Latest 5.2.2 | Kunena Stats 5.2.2 | Kunena Login 5.2.2 | Kunena Search 5.2.2

Maybe first kunena Update to latest version 5.2.8 ?

Thanks for the hint, still the same problem after updating to  5.2.8  The debug error is: Could not instantiate mail function. BTW  Other than Kunena email notifications, all other emailing from the site work (Contacts, ChroneForms etc)

Database collation check: ✔ The collation of your table fields are correct
        

Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |
        

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 120 seconds | Max execution memory: 768M | Max file upload: 256M

Kunena menu details:

Warning: Spoiler!

ID	Name	Menutype	Link	Path	In trash
927	Forum	quick-access	view=home&defaultmenu=1308	forum-recent	No
160	Forum	mainmenu	view=home&defaultmenu=1308	ggc-forum	No
1306	Forum	kunenamenu	view=home&defaultmenu=1307	forum	No
1307	Index	kunenamenu	view=category&layout=list	forum/index	No
1308	Recent Topics	kunenamenu	view=topics&mode=replies	forum/recent	No
1309	Unread	kunenamenu	view=topics&layout=unread	forum/unread	No
1310	New Topic	kunenamenu	view=topic&layout=create	forum/newtopic	No
1311	No Replies	kunenamenu	view=topics&mode=noreplies	forum/noreplies	No
1312	My Topics	kunenamenu	view=topics&layout=user&mode=default	forum/mylatest	No
1313	Profile	kunenamenu	view=user	forum/profile	No
1314	Help	kunenamenu	view=misc	forum/help	No
1315	Search	kunenamenu	view=search	forum/search	No

Joomla default template details : rt_vermilion | author: RocketTheme, LLC | version: 1.8 | creationdate: August 25, 2020

Kunena default template details : Crypsis | author: Kunena Team | version: 5.2.8 | creationdate: 2022-01-01

Kunena template params:

Warning: Spoiler!

DefaultCategoryicon	icon-folder
profileIconset	default
DefaultIconset	default
editorIconset	default
lightboxColor	black
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borderless	1
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avatarType	img-polaroid
labels	0
whoisonlineName	both
formRecover	1
topicicontype	fa
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maps	1
emoticons	1
twitter	1
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avatarSizeX	40
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avatarSizeXThumb	36
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Ebay	1
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nameskinckeditor
ckeditorcustomprefixconfigfile
templatebyText
templatebyName
templatebyLink

Kunena version detailed: Kunena 5.2.8 | 2022-01-01 [ Alcora ]
        | Kunena detailed configuration:

Warning: Spoiler!

Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	20
messages_per_page	12
messages_per_page_search	12
showhistory	1
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shownew	1
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template	crypsis
showannouncement	0
avataroncat	0
catimagepath	category_images
showchildcaticon	1
rtewidth	450
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askemail	1
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filesize	2048
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userlist_posts	1
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file_upload	registered
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hold_guest_posts	0
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send_emails	1
fallback_english	1
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cache_time	60
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avatarcrop	0
user_report	1
searchtime	365
teaser	0
ebay_language	0
ebay_cert_id
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read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
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emailheader	/media/kunena/email/
user_status	1
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social	1
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recaptcha_privatekey
recaptcha_theme	white
keywords	0
userkeywords	0
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version_check	1

| Kunena integration settings:

Warning: Spoiler!

Kunena - Finder Disabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Disabled
 Kunena - Easyblog Disabled
 Kunena - Easyprofile Disabled
 Kunena - Easysocial Disabled
 Kunena - Gravatar Disabled
 Kunena - JomSocial Disabled
 Kunena - Joomla Enabled:  access=1  login=1  
 Kunena - Kunena Enabled:  avatar=1  profile=1  
 Kunena - UddeIM Disabled

| Joomla! detailed language files installed:

Warning: Spoiler!

Joomla! languages installed:
en-AU	English (AU)
en-GB	English (United Kingdom)

Third-party components: None

Third-party SEF components: None

Plugins: Search - Kunena Search 5.2.2

Modules: Kunena Latest 5.2.2 | Kunena Stats 5.2.2 | Kunena Login 5.2.2 | Kunena Search 5.2.2

 

I don't understand explaining that BTW do you have a webshop or eg RSForm! Pro or other form extensions that the BTW  function used

Sorry for the ambiguity, what I am saying is that the problem is limited to Kunena email notifications, other emailing from the website such as ChronoForms or Contact forms continue to work, they continue sending emails while Kunena email notifications do not.

ha okay but do you mean administrator notification when a new message is posted or also for the users of the forum.
are the settings still correct in kunena configuration?
at tab users and also at tab security