[exim] Problems with yahoo

Hello those present,

Of late I am having difficulties delivering mail to users on Yahoo who are
subscribed to a mailing list that I run for the community.
The following error fills my log:

2015-12-08 18:58:29 Start queue run: pid=7681
2015-12-08 18:58:31 1a4rOm-000Cmj-TP [188.125.69.79] SSL verify error:
depth=2 error=unable to get local issuer certificate cert=/
C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc.
- For authorized use only/CN=VeriSign Class 3 Public Pr
imary Certification Authority - G5
2015-12-08 18:58:31 1a4rOm-000Cmj-TP [188.125.69.79] SSL verify error:
depth=2 error=certificate not trusted cert=/C=US/O=VeriSign
, Inc./OU=VeriSign Trust Network/OU=(c) 2006 VeriSign, Inc. - For
authorized use only/CN=VeriSign Class 3 Public Primary Certifica
tion Authority - G5


I have no clue why all of a sudden this is happening. I probably missed
some announcement somewhere???

root@gw:/var/spool/exim/db # exim -bV
Exim version 4.86 #3 built 12-Nov-2015 14:48:32
Copyright (c) University of Cambridge, 1995 - 2015
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 -
2015
Probably Berkeley DB version 1.8x (native mode)
Support for: crypteq iconv() IPv6 use_setclassresources Perl Expand_dlfunc
OpenSSL Content_Scanning DKIM Old_Demime DNSSEC PRDR OCSP
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm
dbmjz dbmnz dnsdb dsearch mysql passwd sqlite
Authenticators: cram_md5 dovecot plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
Configuration file is /usr/local/etc/exim/configure




--
Best regards,
Odhiambo WASHINGTON,
Nairobi,KE
+254733744121/+254722743223
"I can't hear you -- I'm using the scrambler."