email_requests: Catch all connection related exceptions
email_requests: Catch all connection related exceptions

Closes: #4160
Closes: #4105

pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,fujicoin/electrum-fjc,pooler/electrum-ltc,wakiyamap/electrum-mona,vialectrum/vialectrum,fujicoin/electrum-fjc,asfin/electrum,asfin/electrum,cryptapus/electrum,neocogent/electrum,vialectrum/vialectrum,neocogent/electrum,cryptapus/electrum,fujicoin/electrum-fjc,cryptapus/electrum,kyuupichan/electrum,spesmilo/electrum,spesmilo/electrum,wakiyamap/electrum-mona,pooler/electrum-ltc,pooler/electrum-ltc,spesmilo/electrum,wakiyamap/electrum-mona,vialectrum/vialectrum,asfin/electrum,kyuupichan/electrum,kyuupichan/electrum,neocogent/electrum