I just started evaluating mtpolicyd, and this is the first thing I
see in the logs:

```
Sep 28 15:14:46 dovecot mtpolicyd[32030]: error while processing request: plugin spf failed:
***  FATAL PROGRAM ERROR!! Unknown instance method "size"
***  which the program has attempted to call for the object:
***
.        IN        OPT         ; no data
***
***  THIS IS A BUG IN THE CALLING SOFTWARE, which incorrectly assumes
***  that the object would be of a particular type.  The type of an
***  object should be checked before calling any of its methods.
***
Net::DNS::RR 1891
Attempt to reload Net/DNS/RR/OPT.pm aborted.
Compilation failed in require at (eval 639) line 1.

 at /usr/share/perl5/Net/DNS/Resolver/Base.pm line 978.
        Net::DNS::Resolver::Base::_make_query_packet(Net::DNS::Resolver=HASH(0x559247d286b0), "mout.kundenserver.de", "TXT") called at /usr/share/perl5/Net/DNS/Resolver/Base.pm line 414
        Net::DNS::Resolver::Base::send(Net::DNS::Resolver=HASH(0x559247d286b0), "mout.kundenserver.de", "TXT") called at /usr/share/perl5/Mail/SPF/Server.pm line 566
        Mail::SPF::Server::dns_lookup(Mail::SPF::Server=HASH(0x559247d1a3b8), "mout.kundenserver.de", "TXT") called at /usr/share/perl5/Mail/SPF/Server.pm line 463
        Mail::SPF::Server::__ANON__() called at /usr/share/perl5/Error.pm line 465
        eval {...} called at /usr/share/perl5/Error.pm line 454
        Error::subs::try(CODE(0x559247d2daa8), HASH(0x559247d2dc10)) called at /usr/share/perl5/Mail/SPF/Server.pm line 472
        Mail::SPF::Server::select_record(Mail::SPF::Server=HASH(0x559247d1a3b8), Mail::SPF::Request=HASH(0x559247122150)) called at /usr/share/perl5/Mail/SPF/Server.pm line 324
        Mail::SPF::Server::__ANON__() called at /usr/share/perl5/Error.pm line 465
        eval {...} called at /usr/share/perl5/Error.pm line 454
        Error::subs::try(CODE(0x559246f9c520), HASH(0x559247d292e0)) called at /usr/share/perl5/Mail/SPF/Server.pm line 345
        Mail::SPF::Server::process(Mail::SPF::Server=HASH(0x559247d1a3b8), Mail::SPF::Request=HASH(0x559247122150)) called at /usr/share/perl5/Mail/MtPolicyd/Plugin/SPF.pm line 135
        Mail::MtPolicyd::Plugin::SPF::_check_helo(Mail::MtPolicyd::Plugin::SPF=HASH(0x559246fd9698), Mail::MtPolicyd::Request=HASH(0x559246f9d120)) called at /usr/share/perl5/Mail/MtPolicyd/Plugin/SPF.pm line 106
        Mail::MtPolicyd::Plugin::SPF::run(Mail::MtPolicyd::Plugin::SPF=HASH(0x559246fd9698), Mail::MtPolicyd::Request=HASH(0x559246f9d120)) called at /usr/share/perl5/Mail/MtPolicyd/PluginChain.pm line 36
        eval {...} called at /usr/share/perl5/Mail/MtPolicyd/PluginChain.pm line 36
        Mail::MtPolicyd::PluginChain::run(Mail::MtPolicyd::PluginChain=HASH(0x55924666c7c8), Mail::MtPolicyd::Request=HASH(0x559246f9d120)) called at inline delegation in Mail::MtPolicyd::VirtualHost for chain->run (attribute declared in /usr/share/perl5/Mail/MtPolicyd/VirtualHost.pm at line 14) line 18
        Mail::MtPolicyd::VirtualHost::run(Mail::MtPolicyd::VirtualHost=HASH(0x559246756468), Mail::MtPolicyd::Request=HASH(0x559246f9d120)) called at /usr/share/perl5/Mail/MtPolicyd.pm line 354
        eval {...} called at /usr/share/perl5/Mail/MtPolicyd.pm line 339
        Mail::MtPolicyd::_process_one_request(Mail::MtPolicyd=HASH(0x559244913498), Net::Server::Proto::TCP=GLOB(0x559246dd7dd0), Mail::MtPolicyd::VirtualHost=HASH(0x559246756468), Mail::MtPolicyd::Request=HASH(0x559246f9d120)) called at /usr/share/perl5/Mail/MtPolicyd.pm line 411
        eval {...} called at /usr/share/perl5/Mail/MtPolicyd.pm line 410
        Mail::MtPolicyd::process_request(Mail::MtPolicyd=HASH(0x559244913498), Net::Server::Proto::TCP=GLOB(0x559246dd7dd0)) called at /usr/share/perl5/Net/Server.pm line 72
        Net::Server::run_client_connection(Mail::MtPolicyd=HASH(0x559244913498)) called at /usr/share/perl5/Net/Server/PreFork.pm line 226
        eval {...} called at /usr/share/perl5/Net/Server/PreFork.pm line 226
        Net::Server::PreFork::run_child(Mail::MtPolicyd=HASH(0x559244913498)) called at /usr/share/perl5/Net/Server/PreFork.pm line 184
        Net::Server::PreFork::run_n_children(Mail::MtPolicyd=HASH(0x559244913498), 1) called at /usr/share/perl5/Net/Server/PreFork.pm line 381
        Net::Server::PreFork::coordinate_children(Mail::MtPolicyd=HASH(0x559244913498)) called at /usr/share/perl5/Net/Server/PreFork.pm line 328
        Net::Server::PreFork::run_parent(Mail::MtPolicyd=HASH(0x559244913498)) called at /usr/share/perl5/Net/Server/PreFork.pm line 109
        Net::Server::PreFork::loop(Mail::MtPolicyd=HASH(0x559244913498)) called at /usr/share/perl5/Net/Server.pm line 58
        Net::Server::run("Mail::MtPolicyd") called at /usr/bin/mtpolicyd line 12.
```

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