Question After subscription to categories members receives messages in 3/4 fold

Using Kunena 5.2.6. in Joomla 3.10.
All members activated to subscription in tab Users for all categories.
If a new message is placed in a category members receive the message in their email 3 or 4 times.
What do I have to change in the settings?

That's not a configuration problem. If is set on  category subscription to E-mail New Posts, e-mails will be posted for all new postings made in categories that users are subscribed to.
Your users get, for the same single post, more than one mail?

See now your reaction. Thanks.

Indeed, Subscription only on new posts for Categories. See Subscription config below.
All members still receive 3/4 messages of the new single post.

 

Below the configuration:

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: 30 seconds | Max execution memory: 96M | Max file upload: 32M

Kunena menu details:

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ID	Name	Menutype	Link	Path	In trash
1132	Forum	mainmenu	view=home&defaultmenu=639	leden/algemeen/forum	No
1121	Forum	kunenamenu	view=home&defaultmenu=1123	forum	No
1122	Index	kunenamenu	view=category&layout=list	forum/index	No
1123	Recente onderwerpen	kunenamenu	view=topics&mode=replies	forum/recent	No
1124	Ongelezen	kunenamenu	view=topics&layout=unread	forum/ongelezen	No
1125	Nieuw onderwerp	kunenamenu	view=topic&layout=create	forum/nieuw-onderwerp	No
1126	Geen antwoorden	kunenamenu	view=topics&mode=noreplies	forum/geen-antwoorden	No
1127	Mijn onderwerpen	kunenamenu	view=topics&layout=user&mode=default	forum/mijn-laatste	No
1128	Profiel	kunenamenu	view=user	forum/profiel	No
1129	Help	kunenamenu	view=misc	forum/help	No
1130	Zoeken	kunenamenu	view=search	forum/zoeken	No
1131	Forum	kunenamenu	view=home&defaultmenu=973	forum/kunena-2020-04-08	No

Joomla default template details : shaper_helix3 | author: | version: 2.5.8 | creationdate: Jan 2016

Kunena default template details : Blue Eagle5 | author: Kunena Team | version: 1.6.6 | creationdate: 2021-07-25

Kunena template params:

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DefaultCategoryicon
profileIconset	default
DefaultIconset	default
editorIconset	default
bootstrap	1
icomoon	1
tooltips	1
borderless	1
SubjectLengthMessage	1200
fullactions	1
quick	0
displayMenu	1
displayDropdownMenu	1
displayDropdownContent	1
displayProfileBox	0
displayModule	0
displayBreadcrumb	1
displayAnnouncement	1
displayFooter	0
avatarPosition	left
avatarType	img-rounded
labels	0
whoisonlineName	both
formRecover	0
topicicontype	image
fontawesome	1
socialshare	0
socialsharetag
socialtheme	classic
optional_username	1
writeaccess	0
localstorage	0
IconColor	inherit
IconColorNew	#48a348
forumHeadercolor
announcementHeadercolor
announcementBoxbgcolor
frontstatsHeadercolor	#ff0000
whoisonlineHeadercolor
inactiveTabcolor
activeTabcolor
hoverTabcolor
topBordercolor
inactiveFontcolor
activeFontcolor
forumLinkcolor
enableSkinner	0
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Italic	1
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Superscript	1
RemoveFormat	1
BulletedList	1
NumberedList	1
Blockquote	1
JustifyLeft	1
JustifyCenter	1
JustifyRight	1
JustifyBlock	1
Link_Unlink	1
Image	1
Smiley	1
Confidential	0
Hidetext	0
Spoiler	0
Code	0
Ebay	0
Twitter	0
Instagram	0
Soundcloud	0
FontSize	1
TextColor	1
Maximize	1
Map	1
Video	1
editorButtons	Confidential,Hidetext,Spoiler,Ebay,Twitter,Instagram,Soundcloud,Code
nameskinckeditor
avatarSizeX	40
avatarSizeY	90
avatarSizeXThumb	36
avatarSizeYThumb	36
avatarSizeXWelcome	72
avatarSizeYWelcome	72
avatarSizeXList	36
avatarSizeYList	36
avatarSizeXPost	50
avatarSizeYPost	50
avatarSizeXProfile	20
avatarSizeYProfile	20
templatebyText
templatebyName
templatebyLink
fontawesome_layer_v4	0
editor	0
ckeditorParams
wysibbParams
ckeditorcustomprefixconfigfile

Kunena version detailed: Kunena 5.2.6 | 2021-07-25 [ Melia ]
        | Kunena detailed configuration:

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Kunena config settings:
board_offline	0
enablerss	1
threads_per_page	30
messages_per_page	100
messages_per_page_search	15
showhistory	1
historylimit	20
shownew	1
disemoticons	0
template	blue_eagle5
showannouncement	0
avataroncat	1
catimagepath	category_images
showchildcaticon	0
rtewidth	450
rteheight	300
enableforumjump	1
reportmsg	1
username	1
askemail	0
showemail	0
showuserstats	0
showkarma	0
useredit	1
useredittime	0
useredittimegrace	600
editmarkup	1
allowsubscriptions	1
subscriptionschecked	1
allowfavorites	1
maxsubject	50
maxsig	300
regonly	1
pubwrite	0
floodprotection	0
mailmod	0
mailadmin	0
captcha	0
mailfull	1
allowavatarupload	1
allowavatargallery	1
avatarquality	75
avatarsize	20480
imageheight	600
imagewidth	500
imagesize	10000
filetypes	video,txt,rtf,pdf,zip,,tgz,,docx,docs,xls,xlsx,pps,pptx,htm,,mov,mp4 ,pdf,
filesize	12000
showranking	0
rankimages	1
userlist_rows	100
userlist_online	1
userlist_avatar	1
userlist_posts	1
userlist_karma	0
userlist_email	0
userlist_joindate	0
userlist_lastvisitdate	0
userlist_userhits	0
latestcategory	0
showstats	0
showwhoisonline	0
showgenstats	0
showpopuserstats	0
popusercount	5
showpopsubjectstats	0
popsubjectcount	5
showspoilertag	1
showvideotag	1
showebaytag	1
trimlongurls	0
trimlongurlsfront	40
trimlongurlsback	20
autoembedyoutube	1
autoembedebay	1
ebaylanguagecode	en-us
sessiontimeout	1800
highlightcode	0
rss_type	topic
rss_timelimit	month
rss_limit
rss_included_categories
rss_excluded_categories
rss_specification	rss2.0
rss_allow_html	1
rss_author_format	name
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rss_old_titles	1
rss_cache	0
defaultpage	recent
default_sort	asc
sef	1
showimgforguest	1
showfileforguest	1
pollnboptions	4
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pollenabled	0
poppollscount	5
showpoppollstats	0
polltimebtvotes	00:15:00
pollnbvotesbyuser	100
pollresultsuserslist	0
allow_user_edit_poll	0
maxpersotext	50
ordering_system	replyid
post_dateformat	datetime
post_dateformat_hover	datetime
hide_ip	1
imagetypes	jpg,jpeg,gif,png,mp4,mov,video,pdf,
checkmimetypes	1
imagemimetypes	image/jpeg,image/jpg,image/gif,image/png,image/mp4/mov,image/pdf
imagequality	50
thumbheight	32
thumbwidth	32
hideuserprofileinfo	put_empty
boxghostmessage	1
userdeletetmessage	2
latestcategory_in	0
topicicons	1
debug	0
catsautosubscribed	0
showbannedreason	0
showthankyou	0
showpopthankyoustats	0
popthankscount	5
mod_see_deleted	1
bbcode_img_secure	image
listcat_show_moderators	0
lightbox	2
show_list_time	-1
show_session_type	1
show_session_starttime	1800
userlist_allowed	1
userlist_count_users	1
enable_threaded_layouts	0
category_subscriptions	post
topic_subscriptions	disabled
pubprofile	0
thankyou_max	10
email_recipient_count	50
email_recipient_privacy	bcc
captcha_post_limit	0
image_upload	registered
file_upload	registered
topic_layout	threaded
time_to_create_page	0
show_imgfiles_manage_profile	1
hold_newusers_posts	0
hold_guest_posts	0
attachment_limit	15
pickup_category	0
article_display	full
send_emails	1
fallback_english	1
cache	1
cache_time	60
iptracking	0
rss_feedburner_url
autolink	0
access_component	1
statslink_allowed	0
superadmin_userlist	0
legacy_urls	1
attachment_protection	0
categoryicons	1
avatarresizemethod	1
avatarcrop	0
user_report	0
searchtime	365
teaser	0
ebay_language	0
allow_change_subject	1
max_links	6
read_only	0
ratingenabled	0
url_subject_topic	0
log_moderation	0
attach_start	0
attach_end	14
attachment_utf8	1
autoembedsoundcloud	1
emailheader	media/kunena/email/
user_status	0
signature	0
personal	0
social	0
plain_email	0
moderator_permdelete	1
avatartypes	gif, jpeg, jpg, png
smartlinking	0
defaultavatar
defaultavatarsmall	s_
quickreply	0
avataredit	0
activemenuitem
mainmenu_id
home_id
index_id
moderators_id
topiclist_id
misc_id
profile_id
search_id
avatar_type	1
sef_redirect	1
allow_edit_poll	0
use_system_emails	0
autoembedinstagram	1
disable_re	0
email_sender_name
display_filename_attachment	0
new_users_prevent_post_url_images	0
minimal_user_posts_add_url_image	10

| Kunena integration settings:

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Kunena - Finder Enabled
 Kunena - AltaUserPoints Disabled
 Kunena - Community Builder Enabled:  access=1  login=1  activity=1  avatar=1  profile=1  private=1  
 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:

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Joomla! languages installed:
en-GB	English (United Kingdom)
nl-NL	Dutch (nl-NL)

Third-party components: CommunityBuilder 2.6.4+build.2021.11.15.17.48.12.4e5c3fdad

Third-party SEF components: None

Plugins: Search - Kunena Search 5.2.2

Modules: Kunena Search 5.2.2

Indeed, Subscription only on new posts for Categories. See Subscription config below.

With this setting, users get for all messages a mail. Each message is a new post.

Yes, but the problem is that they got not one mail but 3 same mails for one message at the same time. The question is what could cause this problem

I can't reproduce this issue. This happens at all new posts or only randomly? The mail will be sent, if a user click on Submit. But I see in your configuration, that user can always delete his own post. Is it possible that instead of editing the post, some users delete and rewrite it?