Interrupted when sending

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I've been using this add -on just fine in the past. This evening I needed to send out an email to two of my groups and got interrupted with this message:

Interrupted Resume »
Unable to send mail. Unknown php mail() error. Please try switching your concrete site to use SMTP mail.

I tried the SMTP but still had issues, not sure if i completed the boxes correctly? so I then changed it back to the default and on the first try only 1 email got sent, the others all failed. On the 2nd group it keeps getting the error message, so i just decided to ask about what could be the problem?

thanks for the help

Type: Ticket
Status: New
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concrete5 Environment Information

# concrete5 Version

# concrete5 Packages
AJAX Member Directory (1.0.1), Discussion (1.8.8), Event Calendar (3.3.5), Fancy Image Links (1.3.8), Forms With PayPal Payment (2.0.6), Front End Filemanager (1.1), Galleria image gallery (2.0), HeyDesigner (1.5.2), Image Slider (1.1), Keycaptcha (1.0), Lerteco User Importer (2.1.1), List files from set (1.0.4), Mailing List (2.54), Nivo Slider (2.0.1), Parent Link (1.0), Paypal Donations Box (1.0.1), PDF Viewer (1.0), Pro Events (11.5.0), Register User Pro (1.3.16), Registrant Group (1.1), Site Notifications (1.0.1), Sortable Fancybox Gallery (1.17), VideoJS Player (1.0.2), Walkthrough (0.9.3).

# concrete5 Overrides
languages/de_DE, languages/es_AR, languages/pt_PT, languages/it_IT, languages/nl_NL, languages/ja_JP, languages/pl_PL, languages/fa_IR, languages/zh_TW, languages/tr_TR, languages/sv_SE, languages/da_DK, languages/ro_RO, languages/vi_VN, languages/sk_SK, languages/es_MX, languages/nb_NO, languages/es_ES, languages/fi_FI, languages/sl_SI, languages/ar, languages/pt_BR, languages/ru_RU, languages/es_PE, languages/fr_FR, languages/el_GR, languages/cs_CZ

# concrete5 Cache Settings
Block Cache - On
Overrides Cache - On
Full Page Caching - On - In all cases.
Full Page Cache Lifetime - Every 20 minutes.

# Server Software

# Server API

# PHP Version

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, hash, htscanner, iconv, imap, intl, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, openssl, pcre, PDO, pdo_mysql, pdo_pgsql, pgsql, Phar, posix, pspell, Reflection, session, SimpleXML, soap, sockets, SPL, standard, tidy, tokenizer, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, zip, zlib.

# PHP Settings
max_execution_time - 300
log_errors_max_len - 1024
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 512M
post_max_size - 128M
sql.safe_mode - Off
upload_max_filesize - 1024M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
pgsql.max_links - Unlimited
pgsql.max_persistent - Unlimited
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5

Browser User-Agent String

Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

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